EMF Risk Blindspot: The role of modulation in signal interaction
Part 4. Voltage-Gated Ion Channels are like electrically controlled floodgates in the body’s communication network. Calcium is a central message carrier flowing through those gates.
Please note: This is a complex topic. If any factual errors, omissions, or inaccuracies are identified, please contact PSGRNZ so that corrections or clarifications can be considered.
The human body is an electrical machine. Every heartbeat, every thought, every immune response, every moment of sleep or wakefulness depends on the precise movement of electrically charged particles, called ions, across the membranes of your cells. These movements are not random. They are controlled by tiny molecular gates embedded in the cell wall, each one opening and closing in response to electrical signals in the surrounding environment.
These gates are called voltage-gated ion channels, or VGICs.
Understanding them is the key to understanding one of the most important - and most overlooked - debates in modern public health.
Greek biophysicist Dimitris Panagopoulos is a giant in this research field, and a membrane-level or systems-electrophysiology model expands an increasingly compelling theory. Voltage-gated ion Channels (VGICs) may be a central mechanism underlying many of the cellular effects resulting from exposures to radiofrequency electromagnetic fields (RF-EMF)(Panagopoulos et al 2025).
The VGIC framework treats the cell membrane not as a collection of individual, independent channels, but as an integrated electrical signalling system, an interconnected network where all the channel types interact with each other, and where disruption to any part of the system has consequences that ripple through the whole (Panagopoulos et al 2025).
Panagopoulos et al 2025 demonstrate that RF radiation is only bioactive because of the low-frequency pulses and irregular modulations embedded within the signal. These irregular pulses are what ‘actually’ interact - perturb - the VGICs.
THE ORCHESTRA, THE MASTER SWITCH
The lipid bilayer or plasma membrane forms the essential skeleton of the cell against free ionic movement in either direction (1981b). By treating the membrane as an integrated electrical signalling system involving multiple ion-channel classes interacting together, a larger picture of risk builds when RF-EMF’s potential to perturb membrane electrical dynamics and ion-channel behaviour is considered.
All VGICs (including calcium) work identically and the roles of all ions in cells are interconnected. All voltage-gated channels share the S4 voltage-sensing segment. All are therefore subject to the same IFO-driven irregular gating. The forced oscillation of ions inside the channel is the most favourable condition for the gating of the channel.
Calcium’s outsized biological importance in the downstream cascade. The nervous system, rather like an orchestra, has sections that each has a distinct job. The music only works when they all play together in precise timing. The ion channels that line cell membranes work the same way. There are four main classes, each playing a different role in the electrical activity of your cells:
Sodium channels fire first. When a nerve cell receives a signal, sodium rushes in. This is the initial spark that starts an electrical impulse travelling down the nerve fibre. Think of sodium as the percussion: it gives the beat, starts the action.
Potassium channels then bring the note back down. After the sodium surge, potassium flows out of the cell, restoring the electrical balance and resetting the cell so it can fire again. Potassium is the brake, the instrument that stops the note and prepares for the next one.
Chloride channels provide the steadying influence. They regulate the background tone of the cell, shaping its sensitivity and controlling how easily it can be excited or inhibited. Chloride is the strings section: maintaining texture, depth, and stability.
Calcium channels do something different from all the others. When calcium flows in, it does not only carry a charge, it carries a message. Calcium is the translator: it takes electrical activity and converts it into biological action.
Calcium: Ion Most Studied
Calcium could be viewed as the principal soloist, the player whose part is most exposed, whose timing most affects whether the audience notices something is wrong, but who is nonetheless just one member of a larger ensemble.
Calcium is the ion that is most studied. Calcium remains especially important because calcium is uniquely powerful biologically. This is why the calcium ion is often referred to as the ‘master switch’ for cellular activity. A voltage-gated calcium channel (VGCC) is essentially a tiny biological gate embedded in the membrane of a cell that responds to changes in the electrical field across that membrane. Its job is to open and close in response to changes in electrical activity around the cell. When the gate opens, calcium ions flow into the cell.
When a brief pulse of calcium enters a cell, it does not merely change the electrical balance, it triggers a cascade of consequences. Calcium’s biological importance in the downstream cascade, as the master signal transduction ion whose influx triggers ROS production, mitochondrial stress, and gene expression changes, explains why calcium-related endpoints dominate the experimental literature without requiring calcium channel selectivity at the level of the primary mechanism. Depending on the cell type, a calcium signal can cause:
a nerve cell to fire and pass a message to the next neuron
a muscle cell to contract, in the heart, in the gut, in your limbs
a hormone-producing cell to release its chemical messenger into the bloodstream
an immune cell to activate and mount a response
a gene to switch on or off
a cell to grow, mature, or self-destruct
Calcium is not merely a mineral for bones, inside the body it performs a signalling messenger role. Even when a disturbance begins somewhere else in membrane electrophysiology, say, an unusual sodium channel event, or a chloride channel being disrupted, calcium is often where the consequences ultimately land. It is the amplifier.
Calcium is especially critical in:
The developing brain: Calcium signals guide which neurons form connections and which undergo programmed death, sculpting the architecture of the mind
The heart: Precisely timed calcium pulses coordinate the muscle contractions that keep you alive
Endocrine organs: The thyroid, adrenals, and reproductive glands use calcium as a trigger for hormone release
Reproductive cells: Sperm motility and egg fertilisation both depend on calcium signalling
The immune system: Calcium influx activates the cellular machinery that detects and fights infection
ION CHANNEL HYPOTHESIS: FROM CALCIUM TO FULL PICTURE
A large portion of attention on the non-thermal effects of wireless radiation has revolved around VGCCs. Professor Martin Pall, emeritus professor of biochemistry at Washington State University, has been a key figure. From 2013 onwards Pall published a series of papers arguing that voltage-gated calcium channels were extraordinarily sensitive to low-intensity electromagnetic fields, and that VGCC activation could explain a wide range of observed biological effects, from oxidative stress and DNA damage to neurological and reproductive harm.
The particularly important role of electrical activity of the brain (Blackman et al 1979), and the critical function of voltage-gated calcium channels (VGCC) may explain why Pall focussed specifically on Voltage-Gated Calcium Channel (VGCC) signalling (2013, 2014, 2015, 2018, 2018).
Pall argued specifically for voltage-gated calcium channel (VGCC) activation as the primary RF-EMF mechanism. Pall’s important contribution was to draw attention to pharmacological evidence, the attenuation of RF-EMF biological effects by calcium channel blocking drugs, that strongly implicates calcium channels in the downstream cascade. When researchers used calcium channel blocking drugs (the same drugs prescribed for high blood pressure and heart conditions) in experiments on EMF-exposed cells and animals, the biological effects of the EMF exposure were dramatically reduced or eliminated. If blocking the calcium channel blocked the effect, that strongly suggested the calcium channel was the mechanism.
However, Pall proposed that RF carrier waves directly affected VGCCs through forces amplified by the membrane. Dimitri Panagopoulos has critiqued this - the forces exerted by high-frequency carrier waves on channel structures are many orders of magnitude too small to produce direct gating effects, and the cell membrane does not provide the amplification Pall proposed. More fundamentally, Pall’s framework did not account for the centrality of modulation and pulsation, nor did it explain why pulsed signals are more bioactive than continuous-wave signals at the same power density, which is one of the most consistently replicated features of the experimental literature (Panagopoulos 2021).
Therefore, it is important to distinguish Panagopoulos’ VGIC framework from the mechanistically distinct proposal of Pall (2013).
A further criticism surrounded Pall’s hypothesis, if VGCCs were the target, critics asked, why would they be selectively affected? The physics of how a high-frequency radio wave could specifically interact with one class of ion channel, without affecting others, was difficult to explain in simplified models.
PANAGOPOULOS ET AL: THE CELL MEMBRANE AS AN INTEGRATED ELECTRICAL SYSTEM
The mechanistic framework with the strongest explanatory power for non-thermal RF-EMF effects was developed principally by Dimitris Panagopoulos and colleagues at the University of Athens, built systematically over more than two decades. From the outset, it focused consistently on the full ensemble of voltage-gated ion channels (VGICs) rather than any single channel class. (Panagopoulos 2023)
The foundational paper, Panagopoulos, Messini, Karabarbounis, Filippetis and Margaritis (2000), published in Biochemical and Biophysical Research Communications, established the core physical principle. An external oscillating electric field forces all free mobile ions in the vicinity of a cell’s plasma membrane to oscillate on parallel lines and in phase with the applied field. This is not a resonance phenomenon requiring a precise frequency match. It is a direct mechanical consequence of the Coulomb force: any oscillating electric field that is polarised and coherent will drive any free ion into oscillation. The 2000 paper then demonstrated something critical - that this forced ionic oscillation generates forces on the fixed charges of the voltage-sensing S4 segments of voltage-gated ion channels that are comparable in magnitude to the endogenous forces that physiologically gate those channels.
The result was irregular, untimely gating: channels opening and closing at the wrong moments, producing dysfunction rather than simple activation or inhibition, with consequences for intracellular ionic homeostasis that cascade through multiple downstream biological systems.
The 2002 extension expanded on the earlier paper to untangle why pulsed and modulated electromagnetic fields produce greater biological disruption than continuous-wave fields at equivalent power density. The effect lies in the physics of forced oscillation. A continuous sinusoidal wave at a fixed frequency drives ions into a stable, periodic oscillation, a rhythmic perturbation that the channel’s voltage sensor may tolerate within its normal gating range. A pulsed or amplitude-modulated field is different in kind, not just degree. It imposes a constantly varying forcing function. The ELF and ULF components embedded within the modulation envelope, the slow variations in amplitude, the pulsation rhythm, the switching transients, drive ions into irregular, non-periodic oscillation. It is this irregularity, not the energy of the carrier wave, that overwhelms the voltage sensor’s normal gating behaviour and produces dysfunction. (Panagopoulos, Karabarbounis & Margaritis 2002).
The crucial part that is consistently downplayed in mainstream reviews: it is not the carrier frequency of a wireless signal that matters most. It is the low-frequency pulsations and irregular modulations embedded within it.
The carrier frequency of a 4G, 5G, or Wi-Fi signal, in the gigahertz range, is far too fast to drive meaningful ion displacement at the membrane. Ions simply cannot follow oscillations at those frequencies. What they can follow, and what actually drives the biological effect, is the slow modulation envelope: the ELF/ULF variation in the signal that occurs at frequencies directly comparable to the cell membrane’s own endogenous electrical activity.
Whilst the physical mechanism was established in mathematical detail across the 2000 and 2002 papers, it would not acquire its now-standard name, the Ion Forced Oscillation, or IFO, mechanism, until later syntheses, most completely by Panagopoulos, Karabarbounis, Yakymenko and Chrousos (2021).
Panagopoulos landmark 2025 paper in Frontiers in Public Health, co-authored with Yakymenko, De Iuliis, and Chrousos, represented the first comprehensive unification of the IFO-VGIC mechanism with the full downstream biological cascade, tracing the chain from irregular channel gating through ROS overproduction and oxidative stress to specific disease endpoints, while formally establishing why the intense real-world variability of modern wireless signals, absent from most laboratory exposure systems, is itself the primary determinant of bioactivity.
The IFO-VGIC model resolves a problem that has long frustrated this field. It does not require an explanation for why an electromagnetic field would selectively target calcium channels. The question it poses instead is simpler and more general: how does a patterned electrical signal disrupt the coordinated opening and closing of voltage-sensitive channels across the membrane as a whole, and what follows downstream when it does?
The answer implicates the entire ensemble: sodium channels, which initiate electrical activity; potassium channels, which regulate its timing and reset; chloride channels, which shape inhibitory tone and membrane stability; and calcium channels, whose dysregulation is most biologically consequential because calcium is the ion through which electrical activity is translated into cellular action. All of these channels share the S4 voltage-sensing segment. All are therefore subject to the same IFO-driven irregular gating. None is selectively targeted. All are collectively disrupted.
The cell membrane, in this framework, is not a collection of independent molecular gates. It is an integrated electrical signalling system, and it is that system, not any single component within it, that man-made polarised, coherent, pulsed electromagnetic fields are capable of perturbing at non-thermal intensities.
Irregular, untimely gating, i.e., channels opening and closing at the wrong moments, can disrupt the precise electrical choreography on which cellular life depends.
The combination of polarisation, coherence, and intense low-frequency variability is the key to EMF bioactivity. It is what distinguishes every man-made wireless signal from the natural electromagnetic environment in which all biology evolved. And it is what current safety guidelines, built on a thermal threshold established in the 1980s, were never designed to detect.
The ‘VGIC’ approach reflects a broader, systems-level neuroelectrophysiology, and the combination of polarization/coherence and intense low-frequency (ELF/ULF) variability seems to be the key to EMF-bioactivity.
Studies using continuous-wave, non-modulated RF signals are not testing the IFO mechanism. They are testing something else. The consistent pattern in the literature, whereby continuous-wave exposures tend to find fewer effects than real-world pulsed or modulated exposures, is not a collection of contradictory results demanding explanation. Under the IFO model, it is precisely what the physics predicts.
HOW SOLID IS PANAGOPOULOS ET AL’S THEORY?
The IFO mechanism has been subject to computational evaluation. Halgamuge and Abeyrathne (2011) analysed the forced oscillation model alongside the competing Ion Cyclotron Resonance and Ion Parametric Resonance theories under varying viscosity conditions. Under realistic biological viscosity, the actual cytoplasmic drag experienced by mobile ions, the resonance-dependent ICR and IPR theories were found untenable, while the IFO mechanism, which does not require resonance, remained physically viable (Panagopoulos and Karabarbounis, 2011, reply).
Subsequent mainstream reviews challenging the VGIC hypothesis (Wood and Karipidis 2021) did not engage with the IFO model specifically, focusing instead on the direct carrier-wave VGCC activation framework of Pall (2013), which is mechanistically distinct from the IFO-VGIC model and subject to different biophysical constraints.
Wood and Karipidis 2021 had largely evaluated whether high-frequency RF fields (GHz range) can directly gate VGCCs via their carrier frequency. They concluded that the currents induced by fields at ICNIRP guideline limits were many orders of magnitude below those needed to disrupt calcium gating, and that because GHz RF fields alternate too quickly for there to be alterations in ion flow, it was unclear how DC gating currents could be affected, with no evidence for demodulation occurring in biological membranes. They found the greatest proportion (40%) of studies reported no changes at all, and the majority of higher-quality studies did not report an effect.
Critics of the VGIC hypothesis often test the wrong thing, assessing continuous-wave or high-frequency effects rather than the slowly-varying polarized modulation that the IFO model targets.
Wood and Karipidis emphasised that the majority of higher-quality studies did not find effects. However, researchers including Panagopoulos et al (2025) argue that ‘higher quality’ is often defined by criteria that systematically favour negative results, including use of simulated rather than real-life signals, use of continuous-wave exposures rather than pulsed/modulated ones, and animal or cellular studies that don't reproduce real exposure conditions.
WHY DOESN’T THE ICNIRP 2025 ‘GAPS’ PAPER INCLUDE VGICs?
The ICNIRP gaps paper (2025) is explicit about its methodology: it only recommends research to address gaps ‘in so far as there is appropriate evidence that they are likely to help development needs’, rather than merely being ‘possibly relevant’. It would not recommend research merely because an endpoint has not been studied, but would require appropriate evidence and/or argument in support of its inclusion as a data gap (ICNIRP 2025).
The five identified gaps were: pain threshold for RF heating; core temperature rise; ocular injury; pain from contact current; and dosimetry studies. All are thermal or near-thermal in nature.
The paper explicitly addresses several non-thermal mechanisms and explains why they are not classed as gaps. On oxidative stress, for instance: cellular studies reported an increase of ROS levels in some cases, while the majority obtained negative results. Animal studies showed ambiguous results comparing different tissues, organs, and laboratories, and additional research has not been able to reconcile these discrepancies. Accordingly, no data gaps were specified. (ICNIRP 2025)
The VGIC mechanism is not addressed as a named topic but rather, falls within this broader dismissal of non-thermal mechanisms as insufficiently supported to require guideline-relevant research.
INSTITUTIONAL LOGIC
There is a legitimate concern, including from credentialed scientists, about the circularity of how ICNIRP defines what counts as evidence. (E.g. Hardell 2017; Hardell et al 2021; Melnick et al 2025)
Wood and Karipidis (2021) engaged seriously with the VGCC literature and reached conclusions, based on biophysical modelling and a quality-weighted literature review that the evidence did not support VGCC activation as a viable non-thermal mechanism at guideline-level exposures. ICNIRP's gaps paper followed the same institutional logic, requiring a higher bar of evidence than the IFO/VGIC research community has yet achieved to ICNIRP's satisfaction.
Wood and Karipidis’ paper being used as a basis for dismissing VGCC, and Karipidis then becoming ICNIRP chair, and the gaps paper not including VGIC as a research priority, is not necessarily evidence of bad faith, but it is a reasonable basis for concern. ICNIRP’s framework demands stronger mechanistic evidence before it will add non-thermal effects to guidelines, and it can argue this is scientifically conservative and protective.
But critics can fairly respond that the threshold itself is set in a way that consistently excludes biological plausibility evidence that doesn’t yet reach the ICNIRPs determination of a level of clinical consensus.
A BIT OF HISTORY
A foundational experiment came from neurobiologist W. Ross Adey, S.M. Bawin and LK Kaczmarek at the Brain Research Institute, UCLA (1975) when they exposed samples to an oscillating field, demonstrating that at a 147 MHz carrier wave could elicit an enhanced efflux of calcium ions from chick brain tissue only when amplitude modulated at certain sub-ELF frequencies. The authors later theorised that the observed ‘amplitude window’ and ‘frequency window’ behaviour was enhanced by possible long-range cooperative interactions between anionic charge sites on the binding substrate (1978), adding later that low-frequency gradients may be transduced in a specific class of extracellular binding sites (1981a, 1981b, 1982).
Carl Blackman at the US EPA independently replicated and extended this work through the late 1970s and 1980s: Blackman et al. confirmed both the frequency window and a narrow power-density window within which calcium ion efflux was enhanced (1979, 1980a, 1980b, 1981, 1982, 1985), observations that ruled out simple thermal mechanisms and demanded a resonance-type explanation.
Adey’s 1993 paper is significant because it formally consolidated the concept of biological windows, drawing together several threads that had been building through the prior two decades: calcium signalling, membrane-level electromagnetic interactions, coherent cellular signalling, non-linear biological response, and the critical role of information-carrying modulation patterns. It marks a point of theoretical maturation rather than a new departure (Adey 1993).
The experimental findings of Adey and Blackman demanded a physical explanation, and two competing theories emerged. Physicist Abraham Liboff (1985) proposed that oscillating fields could interact with ions moving through cell membranes at specific resonant frequencies, like pushing a child on a swing at exactly the right moment. Lednev (1991) refined this in 1991 by modelling ions inside proteins as tiny oscillators that could be disturbed by matching magnetic field frequencies, and Blanchard and Blackman extended this further in 1994 to cover multiple ion types beyond calcium. Both theories were “resonance” models, meaning they only predicted effects at very specific frequencies, which partially explained the biological windows Adey had observed, but left unanswered what happens when fields oscillate at other frequencies. That gap would be addressed by Panagopoulos in 2000.
The critical shift from resonance theories to the forced-oscillation / irregular gating framework was made by Panagopoulos, Messini, Karabarbounis, Philippetis & Margaritis (2002) at the University of Athens. This is where the VGIC gating language enters explicitly. The 2002 extension in the same journal described the basic mechanism as the forced-vibration of all the free ions on the surface of a cell’s plasma membrane caused by an external oscillating field, showing that this coherent vibration of electric charge is able to irregularly gate electrosensitive channels on the plasma membrane, causing disruption of the cell’s electrochemical balance. The 2002 paper extended the model to include oscillating magnetic fields and explained why pulsed electromagnetic fields can be more biologically active than continuous ones, concluding that low-frequency fields are the most bioactive.
Running in parallel was the work of Martin Blank and Reba Goodman at Columbia University, who took a different route entirely, focusing not on ion channel gating but on direct EMF interaction with DNA. A landmark 1983 Science paper showed that pulsed EMFs induce cellular transcription, the first evidence that non-thermal EMF could alter gene expression directly (Goodman et al. 1983). Through the 1990s and 2000s they developed the idea that DNA itself acts as a kind of antenna for EMF signals, triggering protective stress protein (hsp70) synthesis, and their 2009 review argued that the cellular stress response is far more sensitive to EMF than to heat, with MAPK signalling and ROS production both activated at sub-thermal exposures (Blank & Goodman 2009).
Mechanistically this is distinct from the VGIC gating framework, however the two are not contradictory and may well be complementary. VGIC disruption and direct DNA/stress-response activation could operate simultaneously and independently, converging on the same downstream consequences: ROS overproduction, oxidative stress, and DNA damage. Indeed, VGIC-driven calcium dysregulation could itself amplify the stress response that Blank and Goodman describe, making the two frameworks mutually reinforcing rather than competing. What they share is the fundamental conclusion that non-thermal biological effects are real, and that current safety standards built on thermal thresholds are therefore inadequate.
A BIOLOGICAL TRANSDUCER
The concept of a universal transducer, a single biological mechanism that converts electromagnetic field exposure into cellular biological effects across many frequencies, intensities, and tissue types, was not coined in a single paper by a single person. It emerged progressively. But the researchers who came closest to identifying it first, and in the most experimentally grounded way, were W. Ross Adey and his collaborators, working at UCLA in the 1970s.
What the independent research community has been building toward, from Adey’s calcium experiments in the 1975 through Pall’s VGCC work and Panagopoulos’s IFO model, is the identification of a biological transducer: a mechanism in the cell membrane that converts the energy of an external electromagnetic field into a biological signal inside the cell.
The voltage-gated ion channel, and specifically the voltage sensor within it, is that transducer. It is already designed by evolution to detect tiny changes in the electrical field across the cell membrane. The ‘controversial’ claim, supported by a substantial body of evidence, is that it cannot distinguish between the body’s own endogenous electrical signals and certain patterns of artificial electromagnetic field from wireless technology. When it cannot tell the difference, it responds to both.
What makes it universal is that these channels exist in virtually every cell in the body, neurons, heart muscle, immune cells, reproductive cells, endocrine glands. Whatever tissue you are looking at, the transducer is there. That is why the same mechanism can plausibly explain such a wide range of effects in such different organ systems.
The transducer framing is most powerful as an explanation for why the same downstream effects appear so consistently across so many different experimental conditions, which is its strongest scientific use.
Conclusion
The lay public and the expert scientist alike can question whether the evidentiary bar is being applied consistently, and what the public health implications might be if ICNIRP’s framework is insensitive and unsuitable as for its adopted role as a theoretically protective, public health framework that is depended on by nation states.
Whether that bar is set at the right height is a genuinely open scientific and governance question. Panagopoulos et al. (2025) represents a serious attempt to meet a higher standard of mechanistic comprehensiveness. The fact that it was published in a peer-reviewed Frontiers journal with co-authors including George Chrousos, a highly distinguished endocrinologist, suggests it cannot simply be dismissed. Whether it will shift ICNIRP’s framework is another matter, and whether nation states will gradually, but persistently shift away from dependence on ICNIRP statements is yet to be seen.
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Panagopoulos, DJ.. ‘Comments on Pall’s “Millimeter (MM) wave and microwave frequency radiation produce deeply penetrating effects: the biology and the physics”. Reviews on Environmental Health, vol. 37, no. 2, 2022, pp. 295-297. https://doi.org/10.1515/reveh-2021-0090
Panagopoulos DJ, Karabarbounis A, Lioliousis C. Defining wireless communication (WC) electromagnetic fields (EMFs): A. Polarization is a principal property of all man- made EMFs; B. Modulation, pulsation, and variability are inherent parameters of WC EMFs; C. Most man-made EMF exposures are non-thermal; D. Measuring incident EMFs is more relevant than specific absorption rate (SAR); E. All man-made EMFs emit continuous waves, not photons; F. Differences from natural EMFs. Interaction with matter In: DJ Panagopoulos, editor. Electromagnetic fields of wireless communications: Biological and health effects. Boca Raton: CRC Press (2022)
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Panagopoulos DJ, Karabarbounis A, Chrousos GP. Biophysical mechanism of animal magnetoreception, orientation and navigation. Sci Rep. (2024) 14:30053. doi: 10.1038/s41598-024-77883-9
Panagopoulos DJ, Yakymenko I, De Iuliis GN and Chrousos GP (2025) A comprehensive mechanism of biological and health effects of anthropogenic extremely low frequency and wireless communication electromagnetic fields. Front. Public Health 13:1585441. doi: 10.3389/fpubh.2025.1585441
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