An anemia is a deficiency of the blood cells, but in addition to blood cells, many other cells in the body need vitamin B12, including nerve cells. (sciencedaily.com)
These T cells are crucial for killing other cells in the body that have been infected with germs. (bbc.co.uk)
The insulin signals other cells in the body to take up sugar, the primary energy source for all the body's cells. (closerlookatstemcells.org)