. "Catalysis of the reaction: NAD+ + 7-alpha-hydroxycholesterol = NADH + H+ + 7-alpha-hydroxycholest-4-en-3-one." . . "3beta-hydroxy-delta5-C27-steroid oxidoreductase" . "cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity" . "3-beta-hydroxy-Delta(5)-C(27)-steroid oxidoreductase activity" . "cholest-5-ene-3beta,7alpha-diol 3beta-dehydrogenase activity" . "cholest-5-ene-3beta,7alpha-diol:NAD+ 3-oxidoreductase activity" . . .