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(+) => 4-pregnen-20,21-diol-3-one + nad(+)