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Phytochromes are photoreceptor proteins with a bilin chromophore that undergo photoconversion between two spectrally different forms, Pr and Pfr. Three domains, termed PAS, GAF, and PHY domains, constitute the N‐terminal photosensory chromophore module (PCM); the C‐terminus is often a histidine kinase module. In the Agrobacterium fabrum phytochrome Agp1, the autophosphorylation activity of the histidine...