3M4V:
reference: Structural basis for the properties of two single-site proline mutants of CYP102A1 (P450BM3)., Whitehouse CJ, Yang W, Yorke JA, Rowlatt BC, Strong AJ, Blanford CF, Bell SG, Bartlam M, Wong LL, Rao Z, Chembiochem. 2010 Dec 10;11(18):2549-56. doi: 10.1002/cbic.201000421. PMID: 21110374

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