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cryptochrome

Cryptochromes (from the Greek κρυπτός χρώμα, "hidden color") are a class of flavoproteins found in plants and animals that are sensitive to blue light.

Cryptochromes are receptor proteins that are sensitive to blue light and ultraviolet-A, and contain pterin and flavin prosthetic groups. They are found ubiquitously in plants and mammals, and play a role in these organisms' circadian response to light.

Looking at it from a different angle, cryptochromes have a two-fold role in the circadian function of insects and crustaceans. They participate in phototransduction and light signaling to the clock, and also act as transcriptional repressors of clock genes.

Cryptochromes and photolyases (PLs) are structurally similar, both consisting of a nucleotide-interacting Rossmann-fold domain at the N-terminal and a FAD-binding domain made up of alpha-helices at the C-terminal.

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