These 21 cell clusters could be annotated to 9 cell types (B cells, cancer cells, CD4 T cells, CD8 T cells, endothelial cells, fibroblasts, mast cells, myeloid cells and other T cells) according to specific cell markers (Figures 1E, F), and the marker genes for each cell type were visualized by violin plots (Figure 1G). Here, CD4 is linked to cancer.