BAK1 and neoplasm: Considering the synergistic effect on death induction in tumor cells after the administration of two BH3 peptides from proapoptotic proteins or two synthetic BH3 mimetics [47–49], we established whether the combination of the cell-permeable Bak BH3 peptide (PETK) and the cell-permeable Bax BH3 peptide (PEX) could increase death in malignant hematologic cells.