MS4A1 and gastric neoplasm: To shed light on cell populations present in gastric tumors, we clustered the 59,594 cells and identified 15 subclusters (Figure S6A) which were subsequently determined to be eight cell subgroups including B cells (MS4A1, CD79A), CD4 T − cells (CD3D, IL7R), CD8 T − cells (GZMA, GZMB, CD3E), endothelial cells (PLVAP, NOTCH3, ENG), epithelial cells (MUC1, KRT8), fibroblasts cells (COL1A1, COL1A2), myeloid cells (CD14, S100A9) and plasma cells (SDC1, XBP1) (Fig. 7A and C).