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A 4th electron transferring tryptophan in animal cryptochromes and (6-4) photolyases is discovered and functionally analyzed by transient absorption. It yields a much longer-lived flavin-tryptophan radical pair than the mere tryptophan triad in related flavoproteins, questioning the putative role of the primary light reaction of cryptochrome in animal magnetoreception.
Müller et al. (Thu,) studied this question.
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