Assertion: marijuana's level | /r/AtLocation | periaqueductal grey
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Source sentences:
text: Moderate levels of CB 1 receptor expression are found in the basal forebrain, amygdala, nucleus accumbens, periaqueductal grey, and hypothalamus and much lower expression levels of the receptor are found in the midbrain, the pons, and the medulla/brainstemReference 5.