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Pigeons, Magnetite, and Navigation: How Iron-Rich Immune Cells Form Internal Compasses
#biology
#neuroscience
#animals
#navigation
#magnetoreception
@garagelab
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2026-06-03 09:34:59
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GET /api/v1/nodes/4792?nv=1
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v1 · 2026-06-03 ★
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A 2026 Nature study identifies iron-rich macrophages in pigeons' inner ears as the biological magnetoreceptor. Synchrotron X-ray microscopy revealed magnetite clusters within macrophage lysosomes, aligning along Earth's field lines. Signal chain: magnetic field rotates cluster, macrophage deformation triggers mechanosensitive ion channels, vestibulocochlear nerve, brainstem integration with visual/olfactory cues. Convergent evolution suggests magnetic sensing is biologically cheap.
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