CD34 and acute myeloid leukemia: AML samples fell into two groups; in the first group expression of HoxA9 averaged 2.5 standard deviations and HoxA10 5.7 standard deviations above control cells (n=6 AML samples and n=3 normal CD34+ samples), and in the second group expression averaged 6.5 and 13.5 standard deviations, respectively, above control (n=6 AML samples) (Figure 7A).