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.../sub>]]—and their variants. Dopamine is produced in several areas of the brain, including the [[substantia nigra]] and the [[ventral tegmental area]].<ref ...s the precursor of dopamine, can be given because it can cross the [[blood-brain barrier]].

...ceptor, which is the most abundant [[G protein-coupled receptor]] in the [[brain]].

...actors. Chronic use of this substance may lead to physical changes in the brain, which may affect the behaviour of the individual and their interactions wi ===Brain Function and Adolescent Marijuana Use===