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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Excessive alcohol use costs the country approximately $235 billion every year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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