The CCR4 chemokines were not selected for further analysis as we observed low proportions of non-lymphocyte cell populations expressing the complementary chemokines CCL17 and CCL22 via scRNA-seq (Figure 1G) and observed no enrichment of CCR4+ T cells in glioblastoma (Figures 3C, 4C). Here, CCR4 is linked to glioblastoma.