Pseudomonadati

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Pseudomonadati is a prokaryotic kingdom containing approximately one-third of prokaryote species, mostly gram-negative bacteria and their relatives. The grouping was originally proposed under the name "Hydrobacteria". Hydrobacteria is the closest relative of an even larger kingdom of Bacteria, the Bacillati ("Terrabacteria"), which are mostly gram-positive bacteria. Pseudomonadati and Bacillati were inferred to have diverged approximately 3 billion years ago, suggesting that land (continents) had been colonized by prokaryotes at that time.

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