Genome expansion via lineage splitting…in the cicada endosymbiont Hodgkinia http://www.PNAS.org/content/112/33/10192.abstract Host lifecycle partially enables split
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Katherine Pollard led one study, and Rob Knight led the other
(Finucane et al., 2014; Walters et al., 2014).
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Until recently, most microbiome research had focused on people from WEIRD countries –that is, Western, Educated, Industralised, Rich, and Democratic.
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Most gut microbial species belong to four major phyla: Firmicutes, Actinobacteria, Proteobacteria and Bacteroidetes. Changes in the ratio of Firmicutes and Bacteroidetes correlates with obesity[5].
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but above was discredited somewhat…
https://microbewiki.kenyon.edu/index.php/Gut_Microbiota_and_Obesity