Distribution of IM-9 cells with intergenic distances ≤2 μm during the cell cycle. (A) PML-RAR interdistances. (B) ABL-BCR interdistances. See text (Results) for statistically significant differences. E-S, early-S; M-S, middle-S; L-S, late-S; Pro, prophase; Met, metaphase; Ana, anaphase; Tel, telophase.