1PSA:
reference: Structure of a pepsin/renin inhibitor complex reveals a novel crystal packing induced by minor chemical alterations in the inhibitor., Chen L, Erickson JW, Rydel TJ, Park CH, Neidhart D, Luly J, Abad-Zapatero C, Acta Crystallogr B 1992 Aug 1;48 ( Pt 4):476-88. PMID: 1418819

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