5N1Q:
reference: Phylogenetic and structural comparisons of the three types of methyl-coenzyme M reductase from Methanococcales and Methanobacteriales., Wagner T, Wegner CE, Kahnt J, Ermler U, Shima S, J Bacteriol. 2017 May 30. pii: JB.00197-17. doi: 10.1128/JB.00197-17. PMID: 28559298

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