(B-D) Active BAX (6A7; B) and active caspase‐3 (C) were quantified by staining the cortex of 14‐day‐old MCL‐1Δ/Δ and MCL‐1Δ/Δ Beclin-1+/− mice. The number of BAX‐positive LC3‐negative cells was also quantified. (D) Representative images from at least three sections from each animal were counted. The total number of cells was determined by counting the Hoechst‐positive nuclei. Data are expressed as percent of positive cells for least three animals per genotype±s.d. *P0.05. 