"It turns out that we are only 10 percent human: for every human cell that is intrinsic to our body,..."

“It turns out that we are only 10 percent human: for every human cell that is intrinsic to our body, there are about 10 resident microbes — including commensals (generally harmless freeloaders) and mutualists (favor traders) and, in only a tiny number of cases, pathogens.”

- Some of My Best Friends Are Germs

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