Reaction catalyzed by 3(or 17)beta-hydroxysteroid dehydrogenase (1.1.1.51), 17beta-estradiol 17-dehydrogenase (1.1.1.62), 3alpha(17beta)-hydroxysteroid dehydrogenase (NAD+) (1.1.1.239)
+
NAD+
=
+
NADH
+
testosterone
+
NAD+
=
androstenedione
+
NADH
+
H+
