Figure 6. Striatal TH⁺ neurons express D2 and D4 receptors.

(A) Double fluorescence staining for TH and D1, D2 or D4 receptors in the striatum of mice at PND4 and PND8 is shown. Co-localization was examined by densitometric analysis of red and green fluorescence in a selected region corresponding to the horizontal line in the right panels. The coincidence of the fluorescence peaks is indicative of a high level of co-localization. (B) Immunoreactivity for D1 and D2 dopamine receptors in striatal sections of adult wild-type and D1 or D2 receptor knockout mice, respectively.