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There are more bacteria living on our skin and in our gut than cells in our body. But, it was not clear how the immune system could tell that these bacteria are harmless.

Now, an international team, led by Centenary Institute in Sydney, claims to have discovered a set of peacekeepers-immune cells in outer layers of skin that stop people from attacking friendly bacteria.

Primary source: Proceedings of the National Academy of Sciences of the United States of America (PNAS)

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