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Structure of selected PAS repeat domains. Left, predicted structure of the AHR with its ligand 2,3,7,8-tetrachlordibenzo-p-dioxin [17]. Center, photoactive yellow protein (PYP) with its covalently bound chromophore, 4-hydroxycinnamic acid [186]. Right, the FixL with liganded Heme [187]. Models are presented using PyMOL software version 2.3.4 (Schrodinger, Inc, New York).
