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The Evolution of the Gut Microbiome
We have as many bacteria as cells in our body, which is quite a lot. Bacterial DNA outnumber human DNA to 150 to 1 and 3.3 million genes are in the human microbiome. Each of one of us has between 200 and 1,000 species of commensal bacteria. We also have an oral, a gut, a vaginal and skin microbiome.