4KQ8:
reference: Structural Basis for the Functional Roles of Critical Residues in Human Cytochrome P450 Aromatase., Lo J, Di Nardo G, Griswold J, Egbuta C, Jiang W, Gilardi G, Ghosh D, Biochemistry. 2013 Aug 16. PMID: 23899247

This OCA Structure page
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