| OPIOIDS - DISCOVERY |
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| • | 4000 BC opium papaver somniferum |
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| • | 1805
morphine |
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| • | 1874
heroin |
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| • | 1940s
synthetic opioids |
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| • | 1973
stereospecific binding sites |
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| • | 1975
endogenous opioids |
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