MCL1 and ovarian cancer: Instead, we observed that the existence of preformed BAK/MCL1 complexes also correlates with S63845-induced apoptosis in ovarian cancer cells (Fig. 2h and Supplementary Fig. 3g), in agreement with previous studies in hematopoietic cells [25], suggesting there is a difference between the existence of BAK/MCL1 complexes and merely having high MCL1 expression.