Cytosolic baseline levels of AIF, SMAC and BAX in C57BL/6J and C57BL/6N mice. Using the control mice, cytosolic fractions were subjected to western blotting for AIF, SMAC and BAX (A). Densitometry was performed on these blots and the ratio of the protein-to-beta actin was calculated (B), (C), (D). Data represent mean ± SE of n=4 animals per group. *p< 0.05 (compared with C57BL/6J mice, t=0).