An increase in SGLT3a was responsible for about 45% of the villi growth triggered by reproduction, including cell expansion, but wasn't necessary for entire small intestine lengthening.

Pathogen-fighting immune cells called tissue-resident memory CD8 T cells (TRM cells) go through a surprising transformation -- and relocation -- as they fight infections in the small intestine.

Inside the small intestine, the villi (protrusions that absorb nutrients) and crypts (where the cells supplying the villi are produced) became longer and deeper at the same time as the gut lengthened, ...

Archive Mucosa of the Small Intestine in Pernicious Anemia Authors: Parviz Foroozan, M.D., and Jerry S. Trier, M.D. Author Info & Affiliations Published September 14, 1967 N Engl J Med 1967;277: ...

The research, published August 18 in Nature, focused on the effect of a high-fructose diet on villi, the thin, hairlike structures that line the inside of the small intestine.

The walls of blood capillaries ... , which are one cell thick. The epithelia ... of alveoli in the respiratory system, and the villi in the small intestine, which are one cell thick.