1.12.1.1 peroxidase transferred to EC 1.18.99.1 1.12.1.2 hydrogen dehydrogenase - 1.12.1.3 hydrogen dehydrogenase (NADP+) - 1.12.1.4 hydrogenase (NAD+, ferredoxin) - 1.12.1.5 hydrogen dehydrogenase [NAD(P)+] -