2VE3:
reference: Crystal Structures of Substrate-Free and Retinoic Acid-Bound Cyanobacterial Cytochrome P450 CYP120A1., Kuhnel K, Ke N, Cryle MJ, Sligar SG, Schuler MA, Schlichting I, Biochemistry. 2008 May 31. PMID: 18512957

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