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Expression of TH and D2 receptors in dopamine vs. GABA neurons. Single-cell quantitative RT-PCR was performed on neurons in the VTA of adult male rats. Both DA and GABA neurons expressed TH and D2 transcripts. However, the expression of TH and D2 receptors was much greater in DA neurons than in GABA neurons. **P < 0.0002 and *P < 0.02.
