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In humans, for example, this is the case in the intestinal mucosa or the liver.

It turns out that these enzymes are exceptionally efficient, as the complex sugars at the surface of the intestinal mucosa share chemical resemblance with those found at the surface of blood cells.

IgM is also unique because it is found both in the blood and the mucosa, which is a moist tissue that lines the body canals, including the nose, mouth, and intestine.

In turn, stem cells in the intestine's mucosa differentiate to form new intestinal cells.

The study explored molecular-level changes occurring in human olfactory mucosa cells when exposed to different emissions derived from traffic.