17beta-hydroxyandrostan-1,3-dione + AH2 => 1,17beta-dihydroxyandrostan-3-one + A
17beta-hydroxyandrostan-1,3-dione + ah2 => 1,17beta-dihydroxyandrostan-3-one + a
17beta-hydroxyandrostan-1,3-dione + AH2 => 1,17beta-dihydroxyandrostan-3-one + A
17beta-hydroxyandrostan-1,3-dione + ah2 => 1,17beta-dihydroxyandrostan-3-one + a