Assertion: caffeine's receptor | /r/CapableOf | play role
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Source sentences:
text: Evidence exists that cannabinoid receptors are implicated in the mechanism of action of psychoactive drugs and stress, so enhanced activity of the cannabinoid CB 1 receptors plays a role in the rewarding effects of morphine, heroin, cocaine, ethanol, amphetamine, and nicotine (Herrick et al., 2009).