Fig. 2.
RGS9-2 forms distinct complexes in the striatum depending on the MOR agonist administered and the duration of treatment. (A) RGS9-2 complexes in the striatum following treatment with acute morphine. (B) RGS9-2 complexes in the striatum following treatment with methadone or fentanyl. (C) RGS9-2 complexes in the striatum following chronic morphine treatment (four consecutive days). GRK-2, G protein–coupled receptor kinase 2; PLC, phospholipase C. Figure summarizes findings from Psifogeorgou et al. (2011).