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PAS domain modules in photoreceptor signaling pathways and clock proteins. (A) PYP. (B) PhyA-CRY1 phosphorelay in Arabidopsis for phytochrome regulation of cryptochrome. (C) Clock protein from mouse. (D) WC-1 clock-associated protein from Neurospora crassa. Abbreviations: chr, chromophore; GATA, GATA-like zinc finger domain.
