4-pregnen-20,21-diol-3-one + NAD(+) = 21-hydroxyprogesterone + NADH + H(+)
4-pregnen-20,21-diol-3-one + nad(+) = 21-hydroxyprogesterone + nadh + h(+)
4-pregnen-20,21-diol-3-one + NAD(+) = 21-hydroxyprogesterone + NADH + H(+)
4-pregnen-20,21-diol-3-one + nad(+) = 21-hydroxyprogesterone + nadh + h(+)