The gut’s immune system functions differently in distinct parts of the intestine, with less aggressive defenses in the first segments where nutrients are absorbed, and more forceful responses at the end, where pathogens are eliminated. This new finding may improve drug design and oral vaccines.

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The gut’s immune system functions differently in distinct parts of the intestine, with less aggressive defenses in the first segments where nutrients are absorbed, and more forceful responses at the end, where pathogens are eliminated. This new finding may improve drug design and oral vaccines.