. "\"Catalysis of the reaction: NAD(P)+ + 17-alpha,20-alpha-dihydroxypregn-4-en-3-one = NAD(P)H + H+ + 17-alpha-hydroxyprogesterone.\" [EC:1.1.1.149, MetaCyc:1.1.1.149-RXN]" . . "17-alpha,20-alpha-dihydroxypregn-4-en-3-one dehydrogenase activity" . "EC:1.1.1.149" . "MetaCyc:1.1.1.149-RXN" . . "20alpha-HSD" . "20alpha-HSDH" . "20alpha-hydroxysteroid dehydrogenase" . "20alpha-hydroxy steroid dehydrogenase activity" . "20alpha-hydroxysteroid:NAD(P)+ 20-oxidoreductase activity" .