Assertion: dopamine's effect | /r/HasProperty | silva et al.
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text: An excitatory effect of TH-positive PAG neurons on the adjacent VTA DA cells (Lu et al., 2006) is likely to participate to AMPHs-induced activation of opioid receptors in the PAG, which associates with analgesia, hyperthermia, and hedonic reward reinforcement (Berridge et al., 2009; Cristina-Silva et al., 2017).