IF staining of human GBM specimens showed that ITGAL (CD11a) protein was enriched in PKCδ+ macrophages, which exhibited significantly higher CD11a signals than their PKCδ− counterparts (Figures 4J and 4K), thereby validating the transcriptomic differences observed between Prkcd+ and Prkcd− microglia, monocytes, and MDMs. Here, ITGAL is linked to glioblastoma.