BCL2 and B-cell chronic lymphocytic leukemia: Histogram plots of individual ODN + IL15-stimulated CLL populations (Figure 4A,B) and box-plot analysis of pooled data (Figure 4C) show that BCL2 protein is, on average, more highly expressed in stimulated del(13q)+ CLL than in del(13q)−/− CLL; a finding consistent with past observations, involving freshly isolated CLL cells, that del(13q) influences BCL2 protein levels (del(13q)+ > del(13q)−/−) [51].