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Maximum parsimony phylogenetic trees for Methanosarcina Vht and Vhx subunits. Mm, M. mazei; Mb, M. barkeri; Ma, M. acetivorans; RC-I, rice cluster I methanogen; Af, Archaeoglobus fulgidus. Bootstrap scores greater than 50 are indicated at the nodes. (A) VhtA/VhxA subunits; (B) VhtC/VhxC subunits; (C) VhtG/VhxG subunits.
