a) Cell signatures of microglial and non-microglial cells. Aggregate transcript counts of genes enriched in the given cell type (indicated in parentheses) are color-coded on the respective t-SNE maps. b) Unsupervised clustering of microglia after exclusion of non-microglial cells resulted in 14 major populations, that is clusters. The heatmap displays pairwise cell-to-cell distances. The color scale represents the pairwise distance between cells.