label: (6R)-5,10-methylene-5,6,7,8-tetrahydrofolate + NADH + H(+) => (6S)-5-methyl-5,6,7,8-tetrahydrofolate + NAD(+)
label_lc: (6r)-5,10-methylene-5,6,7,8-tetrahydrofolate + nadh + h(+) => (6s)-5-methyl-5,6,7,8-tetrahydrofolate + nad(+)