1C7H:
reference: Roles of active site aromatic residues in catalysis by ketosteroid isomerase from Pseudomonas putida biotype B., Kim DH, Nam GH, Jang DS, Choi G, Joo S, Kim JS, Oh BH, Choi KY, Biochemistry 1999 Oct 19;38(42):13810-9. PMID: 10529226

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