CD34 and neoplasm: YFP+mCherry+ cells isolated from tumors generated from rescued Tgfbr2 cKO CD34+ SCC cells infected with full-length Tgfbr2 expressed Tgfbr2 mRNA 250-fold over YFP+mCherry- cells isolated from the same tumor or YFP+mCherry+ cells isolated from tumors generated from Tgfbr2 cKO CD34+ SCC cells infected with empty vector (Figure 6G).