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The Radical-Pair Mechanism of Magnetoreception
Open accessAbstract
Although it has been known for almost half a century that migratory birds can detect the direction of the Earth's magnetic field, the primary sensory mechanism behind this remarkable feat is still unclear. The leading hypothesis centers on radical pairs—magnetically sensitive chemical intermediates formed by photoexcitation of cryptochrome proteins in the retina. Our primary aim here is to explain the chemical and physical aspects of the radical-pair mechanism to biologists and the biological and chemical aspects to physicists. In doing so, we review the current state of knowledge on magnetoreception mechanisms. We dare to hope that this tutorial will stimulate new interdisciplinary experimental and theoretical work that will shed much-needed additional light on this fascinating problem in sensory biology.
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“Magnetic fields alter the coherent interconversion between singlet and triplet configurations, and because these spin states lead to different reaction outcomes, reaction yields are determined by spin coherence rather than reaction energetics [33,34,35].”
From The Heart’s Electromagnetic Field in Emotions, Empathy and Human Connection: Biosensor-Derived Insights into Heart–Brain Axis Mechanisms and a Basis for Novel BioMagnetoTherapies (2026) · cites this paper as [35]
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“While RPM does not directly address the cardiac field or emotional processes, it provides an experimental and theoretical basis that renders the hypothesis regarding biologic systems’ sensitivity to such weak magnetic fields mechanistically plausible.”
From The Heart’s Electromagnetic Field in Emotions, Empathy and Human Connection: Biosensor-Derived Insights into Heart–Brain Axis Mechanisms and a Basis for Novel BioMagnetoTherapies (2026) · cites this paper as [35]
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“Although its nanotesla-scale strength (0.1–1 nT) poses a significant limitation for conventional biological interpretation, stochastic resonance and the radical pair mechanism offer plausible theoretical frameworks through which weak magnetic fields could exert measurable effects under specific conditions [35,36,37,38,39].”
From The Heart’s Electromagnetic Field in Emotions, Empathy and Human Connection: Biosensor-Derived Insights into Heart–Brain Axis Mechanisms and a Basis for Novel BioMagnetoTherapies (2026) · cites this paper as [35]
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“The Radical Pair Mechanism (RPM) proposes that magnetic fields can influence chemical reactions by modulating the quantum spin dynamics of transient radical pairs.”
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Citations
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“The in fl uence of magnetic fi elds on the spin dynamics of chemical reactions is considered widely (Hochstoeger et al., 2020; Hore & Mouritsen, 2016; Ritz et al., 2000; Werner et al., 1978; Zadeh ‐ Haghighi & Simon, 2022) the most important candidate for a biologically relevant quantum effect.”
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“…despite major progress in understanding the sensory mechanisms underlying detection of this navigational cue (Zapka et al. 2009; Zapka et al. 2010; Hore and Mouritsen 2016; Xu et al. 2021; Görtemaker et al. 2022; Leberecht et al. 2023), magnetoreception remains one of the most enigmatic forms of…”
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“A leading explanation for these effects is the radical pair mechanism (RPM) [8–10].”
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“In addition, quantum superposition has been reported at the single-electron and single-photon levels in chiral molecular systems (Aiello et al., 2022), while quantum entanglement has been proposed as a mechanism underlying avian magnetoreception and navigation (Hore and Mouritsen, 2016).”
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“Different hypotheses have been proposed to describe the underlining mechanism of this sense, namely the radical-pair mechanism (Ritz et al. 2000; Hore and Mouritsen 2016), the magnetite-based mechanism (Kirschvink et al. 2001), symbiotic magnetic sensing (Natan and Vortman 2017; Natan et al. 2020),…”
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“This effect has been proposed as the basis of magnetoreception in animals, particularly in birds (Ritz et al. 2000; Hore and Mouritsen 2016).”
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“The radical pair hypothesis proposes that light-induced electron transfer reactions generate radical pairs that are sensitive to weak magnetic fields [8 – 10].”
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“The physical basis for such sensitivity likely involves the radical pair mechanism, where weak magnetic fields modulate the spin dynamics of short-lived radical pairs (Hore and Mouritsen 2016).”
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“However, microscopic quantum effects are found widely in nature, from photo-synthesis (Dostal et al., 2012) to avian navigation (Hore and Mouritsen, 2016).”
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“One of the currently discussed models to explain magnetoreception is the radical pair mechanism 12–15 that is based on a photosensitive process in the retina.”
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“In bird cryptochromes, flavin adenine dinucleotide (FAD) is photoreduced by tryptophan to form an SCRP across > 20 ˚A[5, 10].”
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“A key example is RPM applied to flavin–tryptophan radical pairs in retinal cryp-tochromes under blue light in migrating birds, sea turtles, and bees [12].”
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“The radical-pair mechanism seems to be the best-developed physical framework for explaining how weak magnetic fields might alter the spin dynamics and reaction yields of short-lived radical intermediates [22–24].”
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“In some cases, these molecules may participate in magnetorecep-tive processes [44].”
Following the proton: My journey through bioenergetics
Heberle, J. (2026) · Biochimica et Biophysica Acta (BBA) - Bioenergetics · doi:10.1016/j.bbabio.2026.149603
Monodisperse magnetic nanoparticles: chemistry, magnetism and functional applications
Zeng, H., & Sun, S. (2026) · Journal of Magnetism and Magnetic Materials · doi:10.1016/j.jmmm.2026.174471
Nagel, M., Steiner, M., Wenner, N. C. J., Büchel, C., & Kottke, T. (2026) · Biochemistry · doi:10.1021/acs.biochem.6c00479
Kodsomboon, W., Thongyoo, K., Kamoltheptawin, K., Khunnam, W., Thoradit, T., & Pooam, M. (2026) · Seeds · doi:10.3390/seeds5050053
“Cryptochromes are flavin-containing photoreceptors that can participate in magnetic field-sensitive radical-pair chemistry [14–16].”
Developing CHARMM Force Field Parameters for the Radical States of Tryptophan and Tyrosine
Kostritskii, A. Y., Hungerland, J., Schuster, C., & Solov’yov, I. A. (2026) · Journal of Chemical Theory and Computation · doi:10.1021/acs.jctc.6c01280
Karpiuk, J., & Karpiuk, E. (2026) · The Journal of Physical Chemistry Letters · doi:10.1021/acs.jpclett.6c02223
“7 Nevertheless, controlled generation of triplet states, especially multiple triplets, 8 in organic molecules is still in its infancy and requires a deeper understanding of intersystem crossing (ISC) processes, exploration of new pathways of triplet formation, and suitable molecular structures.”
Pathan, M. R. K. (2026) · Research Square · doi:10.21203/rs.3.rs-10937875/v1
The Quantum Lens: Noise-Assisted Sensitivity in Avian MagnetoreceptionPreprint
Yang, C.-D., & Chen, W. (2026) · Research Square · doi:10.21203/rs.3.rs-10851803/v1
Free-ranging Manx shearwaters do not rely on magnetic maps or compasses
Lewin, P. J., Bond, S., Padget, O., Harris, S. M., Lancaster-Reeves, L., de Boer, M., Serafini, P. P., Hughes, G., Wynn, J., Morford, J., et al. (2026) · Current Biology · doi:10.1016/j.cub.2026.08.037
Lithium isotope effects and magnetic interactions in flavin–ascorbyl radical pairs
Mouhamed, A., Al-Khalili, J., & Sacchi, M. (2026) · PLoS ONE · doi:10.1371/journal.pone.0356617
“This can happen when a bond breaks homolytically (each atom takes one electron), when an electron is transferred between two closed-shell molecules, or when two radicals meet in solution [27].”
Zhang, P., Zhang, J., Zhang, T., Peng, Y., & Tong, Y. W. (2026) · ACS Sustainable Chemistry & Engineering · doi:10.1021/acssuschemeng.6c05229
Fazio, M., Stagno, F., Bottaro, A., Gangemi, S., & Allegra, A. (2026) · Medical Hypotheses · doi:10.1016/j.mehy.2026.112164
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Adams, B., Marais, A., Krüger, T. P. J., & Petruccione, F. (2026) · Frontiers in Photobiology · doi:10.3389/fphbi.2026.1911803
Optically addressable and programmable spins in DNAPreprint
Meng, K., Einholz, C., Krueger, L., Rosenow, M., & Bucher, D. (2026) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.64898/2026.09.14.751464
“In the following, we investigate more complex DNA architectures, starting with double-stranded oligonucleotides (see Supplementary Notes 9 and 10 for characterization details).”
InfluentialMicroscopic dissection of chirality-induced spin selectivity in cryptochrome
Denton, M. C. J., Pearse, C. D., Kattnig, D. R., & Smith, L. D. (2026) · The Journal of Chemical Physics · doi:10.1063/5.0348452
Multimodal imaging reveals no evidence for magnetite-based magnetoreceptors in the mole-rat eye
Moritz, L., Nath, K., Walsh, E. P., Sternberg, A., Becher, E., Lange, A., Falkenberg, G., Brückner, D., Diwoky, C., Bredies, K., et al. (2026) · iScience · doi:10.1016/j.isci.2026.117548 · Cited by 1
“…harbor a chain of single-domain (sd) magnetite (Fe 3 O 4 ), turning the cells into miniature compass needles, 13 gave rise to the third idea, which states that similar magnetite crystals, coupled to membranes or ion channels, could turn sensory cells in higher organisms into mag-netoreceptors.”
Quantum Biology 2.0: Traversing and harnessing protein superhighway networks of light and life
Christ, M., Izadyari, M., Murray, J., Bajpai, S., Torres, J., Pettini, M., & Kurian, P. (2026) · Protein Science · doi:10.1002/pro.70759
Quantum neuromorphic computing: harnessing noise and adaptation for scalable quantum processors
Majumdar, M. G. (2026) · Discover Computing · doi:10.1007/s10791-026-10415-3
“A second case is magnetoreception in migratory birds [128, 129], modeled via the radical pair mechanism in cryptochrome proteins [130].”
Kumar, K., Timmer, D., Khazani, M., Dautaj, G., Brinkmann, S., Götze, J. P., Saalfrank, P., Gribakin, B. F., Sio, A. D., Mouritsen, H., et al. (2026) · Journal of the American Chemical Society · doi:10.1021/jacs.6c14527
Self-citation
Metadata
- Authors
- Hore, P. J., & Mouritsen, H.
- Affiliations
- University of Oxford (GB)
- Carl von Ossietzky Universität Oldenburg (DE)
- Corresponding author
- Mouritsen, Henrik
- Venue
- Annual Review of Biophysics
- Publisher
- Annual Reviews
- Published
- 2016-07-05
- Volume
- 45
- Issue
- 1
- Pages
- 299-344
- ISSN
- 1936-122X (ISSN-L)
- 1936-1238
- OpenAlex
- W2342982958
- Cited by
- 813
- References
- 222
- Citations by year
- 2026: 119 · 2025: 96 · 2024: 83 · 2023: 89 · 2022: 80 · 2021: 100 · 2020: 72 · 2019: 64 · 2018: 55 · 2017: 39 · 2016: 13
- FWCI
- 6.91
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Annual Review of Biophysics (publishedVersion)
- PubMed (publishedVersion)
- Funders
- EMF Biological Research Trust
- European Commission (FP7/2007–2013/ERC, 2007–2013, FP7 2007-2013, FP7/2007)
- Deutsche Forschungsgemeinschaft (GRK1885, FP7/2007–2013)
- Volkswagen Foundation
- U.S. Air Force (FA9550)
- Advanced Research Projects Agency
- Engineering and Physical Sciences Research Council (EP/L011972/1)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Electromagnetic Fields and Biological Effects
- Physical Sciences › Chemistry › Spectroscopy › Electron Spin Resonance Studies
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geomagnetism and Paleomagnetism Studies
- Keywords
- magnetoreception, radical pairs, cryptochrome, bird migration, magnetic field sensing, photoexcitation, radical pair mechanism, sensory biology
- MeSH terms
- Animals, Birds, Free Radicals, Retina, Space Perception, Animal Migration, Cryptochromes, Magnetic Fields
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