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Different environment around the side chains of P1-His and P1-Phe in SGP crystal structures. Overlay of the S1 subsite in crystal structures of SGP bound to the reaction product of angiotensin II (Protein Data Bank code 1S2K; carbon, wheat) and the inhibitor TA1 (PDB code 2IFW; carbon, green) obtained after a least squares alignment of the two enzyme structures.
