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Our bodies are confused by this 21st-century world.

IN the last half-century, the prevalence of autoimmune disease — disorders in which the immune system attacks healthy tissue in the body — has increased sharply in the developed world.

Many researchers are interested in how the human microbiome — the community of microbes that live mostly in the gut and are thought to calibrate our immune systems — may have contributed to the rise of these disorders.

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