We deposited our snRNA-Seq data to GEO accession GSE167920. Go to https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE167920. Code is publicly available at https://github.com/pfenninglab/nhp_snrna_striatum_analysis and https://github.com/rewardlab/NHPstriatum. Any additional information required to reanalyze the data reported in this paper is available from the lead contact upon reasonable request.