@ARTICLE{TreeBASE2Ref14838, author = {C?line Brochier and Herv? Philippe}, title = {A non-hyperthermophilic ancestor for Bacteria.}, year = {2002}, keywords = {}, doi = {10.1038/417244a}, url = {}, pmid = {}, journal = {Nature}, volume = {417}, number = {}, pages = {244}, abstract = {The first phyla that emerge in the tree of life based on ribosomal RNA (rRNA) sequences are hyperthermophilic, which led to the hypothesis that the universal ancestor, and possibly the original living organism, was hyperthermophilic1. Here we reanalyse the bacterial phylogeny based on rRNA using a more reliable approach, and find that hyperthermophilic bacteria (such as Aquificales and Thermotogales) do not emerge first, suggesting that the Bacteria had a non-hyperthermophilic ancestor. It seems that Planctomycetales, a phylum with numerous peculiarities, could be the first emerging bacterial group.} }

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