1OPY:
reference: High-resolution crystal structures of delta5-3-ketosteroid isomerase with and without a reaction intermediate analogue., Kim SW, Cha SS, Cho HS, Kim JS, Ha NC, Cho MJ, Joo S, Kim KK, Choi KY, Oh BH, Biochemistry. 1997 Nov 18;36(46):14030-6. PMID: 9369474

This OCA Structure page
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