CD28 and cancer: Analysis of cluster-specific genes indicates that these clusters correspond to cancer cells (GFP, Crabp1, Ank), myeloid cells (Aif1, Ctsc, Mpeg1), lymphoid cells (Il2rb, Cd28, Cd3e/g/d, Cd37), and stromal cells (Col1a1/2, Lum, Eln, Dpt), respectively (Figure 1B).