“Researchers at the University of Adelaide in Australia worked with colleagues at the University of Colorado in the United States to pinpoint a key mechanism in the body’s immune system that amplifies addiction to opioid drugs. The researchers said that opioid drugs such as morphine and heroin bind to immune receptors in the brain known as TLR4 which then act as amplifiers for addiction, ramping up the “reward” effect of drugs of abuse to a high degree.”
http://www.rawstory.com/rs/2012/08/15/addiction-to-morphine-and-heroin-can-be-blocked/
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