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Location of CB1 and TRPV1 receptors in specific neuronal subpopulations within basal ganglia circuits. Regulatory pathways are indicated in blue, whereas inhibitory and excitatory inputs are indicated in red and green respectively. Unknown neurons are shown in black. CB1, cannabinoid receptor type 1; GABA, γ-aminobutiric acid; GLU, glutamate; TRPV1, transient receptor potential vanilloid type 1.
