PTGDS and neoplasm: Bioinformatic analyses revealed five major cell types based on hallmark gene expression: myeloid (Cd11b; 12 clusters), lymphoid (Cd33/Ncr1/B220/Cd19; 5 clusters), tumor (Olig2/Cd276/Col11a1; 1 cluster), endothelial (Enpp2; 1 cluster) and fibroblast (plp1/Ptgds; 1 cluster) cells (Fig. 5B).