Figure 1.

Double staining for Ki‐67 plus caspase‐3 on Burkitt's lymphoma or atypical Burkitt/Burkitt‐like lymphoma (BL/BLL). Caspase‐3‐positive cells (red) are intermingled in the proliferation of Ki‐67‐positive cells (brown). A proportion of proliferating cells, which are Ki‐67‐positive, are also simultaneously stained as apoptotic cells, which are caspase‐3‐positive (red + brown, arrows). In this case, the percentage of cells positive for caspase‐3 is approximately 25% (low caspase‐3 group).