CD2 and neoplasm: To test if the effect of rbf1 on ept/M(3) tumor growth is due to enhanced rates of apoptosis, the previous experiment was repeated in ept,H99/M(3) tumors that express UAS-GFP under control of the eyFLP and Actin5c>CD2>Gal4 transgenes [42], such that each ‘flip-out’ event creates a clone of GFP-positive mutant cells.