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Coevolution of beneficial microorganisms with the mammalian intestine fundamentally shapes mammalian physiology. Here, we report that the intestinal microbe Bacteroides fragilis modifies the homeostasis of host invariant natural killer T (iNKT) cells by supplementing the host’s endogenous lipid antigen milieu with unique inhibitory sphingolipids. The process occurs early in life and effectively impedes...
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