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. Read full article...
Source: https://www.rockefeller.edu/news/25935-new-study-reveals-gut-segments-organized-function-opportunities-better-drug-design/Isn't this related to the fact that in the jejunum the lymphatic organs are spread around the surface and there isn't that much of them as opposed to the ileum where they are aggregated in patches (peyer's patches)?