Similar to p16p19−/−; Kras(G12V) histiocytic sarcomas (Fig. 2D) and leukemias (Fig. 1E), MLL-AF9/DsRed tumors were CD48hi (95.8±2.4%), CD47hi (95.3±2.9%), Mac1hi (83.4±7.8%), Gr1mid/lo (20.2±2.4%), and B220−/lo, CD4−/lo, CD8−/lo, Ter119−/lo (Fig. S3B, n = 10). The gene discussed is CD4; the disease is leukemia.