2ER7:
reference: X-ray analyses of aspartic proteinases. III Three-dimensional structure of endothiapepsin complexed with a transition-state isostere inhibitor of renin at 1.6 A resolution., Veerapandian B, Cooper JB, Sali A, Blundell TL, J Mol Biol 1990 Dec 20;216(4):1017-29. PMID: 2266553

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