Phylogenomic analysis of proteins that are distinctive of Archaea and its main subgroups and the origin of methanogenesis.

BMC Genomics · 2007 · PMC1852104 · PMID 17394648

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highly significantno p-value reported

These observations are highly significant because they strongly suggest that Archaeoglobus and all of the methanogens shared a common ancestor exclusive of all other archaea.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.