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From Self-sufficiency
- ...of pleasure. They can be released in response to pain, strenuous exercise, orgasm, or excitement. ...xone]] and [[naltrexone]]; the development of tolerance to morphine may be inhibited by [[NMDA]] antagonists such as [[ketamine]] or [[dextromethorphan]].<ref>{87 KB (12,376 words) - 16:51, 27 September 2010