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Action and domain structure of plant flavoprotein blue-light receptors. (A) Stylized representation of a typical action spectrum for phototropism. (B) Domain structures of cryptochrome 1, phototropin 1 and zeitlupe: PHR, photolyase homology region; CCT, cryptochrome C-terminus; LOV, light, oxygen or voltage sensing; KD, kinase domain; F, F-box; Kelch, kelch repeats.
