She says the chimpanzee tissue showed a severe loss of immune system cells.

VOA: special.2009.09.08

In particular, low-status individuals showed high levels of activity in genes associated with the production of various immune-related cells and chemical signalling factors, as well as those to do with inflammation (a general immune response that involves tissue swelling and increased immune-cell activity in the affected area).

ECONOMIST: Social status and health

Some experienced serious side effects, including three people who died likely because their immune systems attacked healthy tissue.

WSJ: New Cancer Drugs Use Body's Own Defenses

As a professor of neurology at Harvard Medical School, he studied multiple sclerosis, a genetically conditioned disease in which the immune system mistakes nerve tissue for a foreign invader and systematically destroys it.

FORBES: Profitable pedigree