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'The bacteria that live in your intestines are a mixed blessing. Scientists have known for decades that this so-called microbiota helps us digest our food and crowds out infectious germs. The bugs have also been implicated in allergies and obesity. Now, a new study adds one more potential malady to the list: rheumatoid arthritis.

“It’s been suspected for years and years, both in humans and in the animal model, that the development of autoimmune diseases like arthritis is dependent on the gut microbiota,” says immunologist Diane Mathis of Harvard Medical School in Boston. Now, she says, those suspicions are beginning to be confirmed in humans. “It’s a very striking finding.”'

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