The athletic adults also appeared to have healthier and younger - looking immune systems, at least when it came to an organ called the thymus that's responsible for generating key immune cells called T cells. (businessinsider.com)
Functions as the site where key immune cells (T cells) mature into cells that can fight infection and cancer. (cancerresearch.org)
In April two studies of simian immunodeficiency virus, a kin of HIV that infects monkeys, reported that the virus swiftly infects and decimates key immune cells in the gut within days, not years, of infection. (discovermagazine.com)