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Heme environment. (A) Ligand-binding pocket. Tyr-140 is shown hydrogen bonding (red dashes) to the heme-bound oxygen ligand. Trp-9 and Asn-74 interact with Tyr-140. The proximal ligand, His-102, is also shown. (B) The YxSxR motif, corresponding to residues Tyr-131, Ser-133, and Arg-135, coordinates heme propionates.
