Cell growth arrest by ICSBP in Bcr/Abl-transformed ICSBP^-/- myeloid progenitor cells. (A) Growth rate of Tot2 and Tot2p210 cells transduced with the indicated viruses. Total cell yields are counted on the indicated days. (B) Cell cycle analysis. Cells transduced with control or ICSBP retrovirus were analyzed for DNA contents on the indicated days.