sarcosine + (6S)-5,6,7,8-tetrahydrofolate + O2 = (6R)-5,10-methylene-5,6,7,8-tetrahydrofolate + glycine + H2O2
sarcosine + (6s)-5,6,7,8-tetrahydrofolate + o2 = (6r)-5,10-methylene-5,6,7,8-tetrahydrofolate + glycine + h2o2