Comparison of AHI-1 transcript levels in different subpopulations of primary AML and ALL cells. Absolute AHI-1 transcript levels calculated as described in “Patients, materials, and methods” from real-time RT-PCR analyses of RNA isolated from the populations indicated. (A) Comparison of CD19^– and CD19⁺ subpopulations of normal human BM CD34⁺ cells (open = 4) and CD34⁺ ALL cells with Ph⁺ (n = 8) or Ph^– (n = 4) genotypes. (B) Comparison of different subpopulations of normal human BM cells (n = 4) and different FAB subtypes of AML (n = 15). The mean levels of AHI-1 expression in each population are indicated by the horizontal bars.