Direct observation of a photoinduced radical pair in a cryptochrome blue-light photoreceptor.

[摘要]：Blue-light excitation of the photoreceptor cryptochrome generates a transient radical pair by electron transfer from a tryptophan (Trp) at the surface to the flavin cofactor in the center of the protein. Simulated EPR spectra show that the electronic coupling parameters of these radical pairs are suitable for animal magnetoreception.

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