5,10-methylenetetrahydromethanopterin reductase; 5,10-methylenetetrahydromethanopterin cyclohydrolase; N5,N10-methylenetetrahydromethanopterin reductase; methylene-H4MPT reductase; coenzyme F420-dependent N5,N10-methenyltetrahydromethanopterin reduc • • •