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Researchers have long known that hallucinogens activate specific receptors in the brain, called 5-HT2A receptors (2ARs), that are normally triggered by the neurotransmitter serotonin. Neurotransmitters are chemicals that one brain cell launches at receptors on another to trigger a nerve impulse in the receiving cell. However, a fundamental mystery has been why other compounds that activate the same receptors are not hallucinogenic

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