BCL2 and B-cell chronic lymphocytic leukemia: Nonetheless, no statistically significant difference (p = 0.84) was noted between del(13q)+ and del(13q)−/− CLL cohorts in the magnitude of the division-linked decline (latter calculated by comparing BCL2 levels in undivided cells versus those representing three divisions) (Figure 4D), suggesting that additional factors are also contributing to diminished BCL2 expression during cycling.