This article is for suscribers only. If you suscribe go here: http://www.sciencenews.org/pages/search_results.asp If you don't here is an abstract that the article is based on: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=16274263&query_hl=2 The work studies the endorphin, prodynorphin in Chimps and Humans. It purports to show that "This is the first documented instance of a nueral gene that has had its regulation shaped by natural selection during human origins" (Matthew Hahn, U. Indiana). Human generally contain 2-4 copies of the regulatory sequence in contrast to one copy for chimps, gorillas, orangutans, baboons and macaques. The investigators contend that changes in the prodynorphin regulatory sequence must have...