mth  Methanothermobacter thermautotrophicus
         mmg  Methanothermobacter marburgensis
         mwo  Methanothermobacter wolfeii
         mtee  Methanothermobacter tenebrarum
         metc  Methanothermobacter sp. CaT2
         mete  Methanothermobacter sp. EMTCatA1
         metz  Methanothermobacter sp. MT-2
         metk  Methanothermobacter sp. KEPCO-1
         mthm  Methanothermobacter sp. THM-1
         metj  Methanothermobacter sp. THM-2
         mst  Methanosphaera stadtmanae
         metb  Methanosphaera sp. BMS
         meis  Methanosphaera sp. ISO3-F5
         mru  Methanobrevibacter ruminantium
         msi  Methanobrevibacter smithii
         meb  Methanobrevibacter sp. AbM4
         mmil  Methanobrevibacter millerae
         meye  Methanobrevibacter sp. YE315
         mol  Methanobrevibacter olleyae
         maro  Methanobrevibacter arboriphilus
         metv  Methanobrevibacter sp. TLL-48-HuF1
         mine  Methanobrevibacter intestini
         mel  Methanobacterium lacus
         mew  Methanobacterium paludis
         meth  Methanobacterium sp. MB1
         mfc  Methanobacterium formicicum BRM9
         mfi  Methanobacterium formicicum DSM1535
         mcub  Methanobacterium congolense
         msub  Methanobacterium subterraneum
         metn  Methanobacterium sp. MZ-A1
         mett  Methanobacterium sp. BRmetb2
         meto  Methanobacterium sp. BAmetb5
         meme  Methanobacterium alkalithermotolerans
         mfeg  Methanobacterium ferruginis
         meer  Methanobacterium sp. ERen5
         mrid  Methanobacterium aridiramus
         meac  Methanobacterium nebraskense
         mfv  Methanothermus fervidus
         msoc  Methanothermus sociabilis