2HSD:
reference: The refined three-dimensional structure of 3 alpha,20 beta-hydroxysteroid dehydrogenase and possible roles of the residues conserved in short-chain dehydrogenases., Ghosh D, Wawrzak Z, Weeks CM, Duax WL, Erman M, Structure 1994 Jul 15;2(7):629-40. PMID: 7922040

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