PDPN and neoplasm: According to the marker genes, these clusters were designated as blood endothelial cells (FLT1; clusters 0–3, 5, 6), lymphatic endothelial cells (PDPN: cluster 4), tumor endothelial cells (HSPG2: clusters 0 and 2–6), and normal endothelial cells (MT2A; clusters 0–6) (Fig. 3d).