"Saliva from humans has yielded a natural painkiller up to six times more powerful than morphine, researchers say. The substance, dubbed opiorphin, may spawn a new generation of natural painkillers that relieve pain as well as morphine but without the addictive and psychological side effects of the traditional drug."
http://www.newscientist.com/article.ns?id=dn10514&feedId=online-news_rss20
http://www.newscientist.com/article.ns?id=dn10514&feedId=online-news_rss20