M00567  Methanogenesis, CO2 => methane
       M00357  Methanogenesis, acetate => methane
       M00356  Methanogenesis, methanol => methane
       M00563  Methanogenesis, methylamine/dimethylamine/trimethylamine => methane
       M00358  Coenzyme M biosynthesis
       M00608  2-Oxocarboxylic acid chain extension, 2-oxoglutarate => 2-oxoadipate => 2-oxopimelate => 2-oxosuberate
       M00174  Methane oxidation, methanotroph, methane => formaldehyde
       M00346  Formaldehyde assimilation, serine pathway
       M00345  Formaldehyde assimilation, ribulose monophosphate pathway
       M00344  Formaldehyde assimilation, xylulose monophosphate pathway
       M00378  F420 biosynthesis, archaea
       M00935  Methanofuran biosynthesis
       M00422  Acetyl-CoA pathway, CO2 => acetyl-CoA