1.12.98.2 5,10-methenyltetrahydromethanopterin hydrogenase; H2-forming N5,N10-methylenetetrahydromethanopterin dehydrogenase; nonmetal hydrogenase; N5,N10-methenyltetrahydromethanopterin hydrogenase; hydrogen:N5,N10-methenyltetrahydromethanopterin oxidoreduct • • •