Amphetamine induces D2R dimerization in AISS rat striatum. A, Western blot analysis of the expression levels of D2R dimers and monomers in striatal extracts of control and AISS rats. α-tubulin was used as a loading control. B-C, Bar graphs summarizing the western blot data. *, **Significantly different from control group (p < 0.05, p < 0.01; n = 5). Data were analyzed by t-test.