The antennae containcryptochrome, a photoreceptor protein sensitive to the violet-blue part of the light spectrum.
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Yet, it has also been suggested that homing pigeons and other birds use the visually mediatedcryptochromereceptor as a compass.
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Activation ofcryptochromemay affect the light-sensitivity of retinal neurons, with the overall result that the bird can see the magnetic field.
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The surrounding magnetic field affects the kind of this correlation (parallel or anti-parallel), and this in turn affects the length of timecryptochromestays in its activated state.
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