Nr4a1-eGFP and DAT are striosome-enriched. A, Nr4a1 is enriched in striosomes and colocalizes with MOR, a striosomal marker. Scale bar, 500 μm. B, Enlarged images from A to better show localization of Nr4a1-eGFP and MOR in the dorsomedial striatum (DMS), dorsolateral striatum (DLS), and Nucleus accumbens (NAc). Scale bar, 250 μm. C, Sample images demonstrating specificity of Nr4a1-eGFP and DAT colocalization in the DMS and DLS but not in the NAc. Scale bar, 250 μm.