4XO6:
reference: Human 3alpha-hydroxysteroid dehydrogenase type 3: structural clues of 5alpha-DHT reverse binding and enzyme down-regulation decreasing MCF7 cell growth., Zhang B, Hu XJ, Wang XQ, Theriault JF, Zhu DW, Shang P, Labrie F, Lin SX, Biochem J. 2016 Apr 15;473(8):1037-46. doi: 10.1042/BCJ20160083. Epub 2016 Feb, 29. PMID: 26929402

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