Have you heard of Lesch-Nyhan Syndrome? - Self cannibalism.
Listen to NPR Science Friday June 6th 2008, it's about half-way through. Interviewee is
Richard Preston with a new book "Panic in Level 4"
For more information visit:
Lesch-Nyhan Syndrome Information Page at the National Institute of Neurological Disorders and Stroke (NINDS)
Quote from website: "Lesch-Nyhan syndrome (LNS) is a rare, inherited disorder caused by a deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HPRT). LNS is an X-linked recessive disease-- the gene is carried by the mother and passed on to her son."