Meis1 induces a gene expression signature consistent with cell-cycle entry. (A) Quantitative RT-PCR analysis on 24 G₁-phase regulators. The data are plotted relative to the endogenous control Abl and are expressed as the mean ± SD of 3 independent transductions. P > .05 are unlabeled, *P < .05, **P < .01, and ***P < .001. (B) Cytokine stimulation of Hoxa9 and ND13 BM cells transduced with Meis1 show a significant induction of Ccnd3 levels compared with MIY and M33-Meis1 stimulation levels.