(6S)-5,6,7,8-tetrahydrofolate + glycine + NAD(+) => (6R)-5,10-methylene-5,6,7,8-tetrahydrofolate + NH4(+) + CO2 + NADH
(6s)-5,6,7,8-tetrahydrofolate + glycine + nad(+) => (6r)-5,10-methylene-5,6,7,8-tetrahydrofolate + nh4(+) + co2 + nadh