Natural Painkiller Found In Human Saliva
http://www.nature.com/news/2006/061113/full/061113...
http://www.nature.com/news/2006/061113/full/061113...Opiorphin is six-times more potent than morphine and works by preventing the breakdown of enkephalins, which activate opiate receptors that block pain signals from reaching the brain, although that may not be its only effect.
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