riboflavin + NADH + 2 H(+) => reduced riboflavin + NAD(+)
riboflavin + nadh + 2 h(+) => reduced riboflavin + nad(+)
riboflavin + NADH + 2 H(+) => reduced riboflavin + NAD(+)
riboflavin + nadh + 2 h(+) => reduced riboflavin + nad(+)