. "Methyl-coenzyme M reductase (MCR) is the enzyme responsible for microbial formation of methane. It is a hexamer composed of 2 alpha (Pfam:PF02249), 2 beta (Pfam:PF02241), and 2 gamma (this family) subunits with two identical nickel porphinoid active sites [1]. " . "MCR_gamma" . "Methyl-coenzyme M reductase gamma subunit" . "Mian N, Bateman A" . "Domain" . . . . . . . . . .