with orthologous marker gene lists from several databases13,17,22 confirmed the identity of the clusters (p < 0.05, Benjamini-Hochberg corrected, Hypergeometric tests). Violin plots showing the expression levels of marker genes in each major class confirmed the basic validity of our experimental and analytic methods (Figure 1G). Together, these results provide a broad transcriptional catalogue of cell classes in the NHP striatum and a rich dataset for future exploration.