aResults are means of three repeats of at least three separate measurements of the activity of cytochrome c oxidase activity as percent of control (no UCB). bMolar ratios of bilirubin to albumin (r). cMouse liver mitochondria. dMouse brain mitochondria. eAll p < 0.001 vs. Bf = 22-31 nM, and p < 0.05 vs Bf = 60-61 nM, respectively. No significant differences between: Bf = 22-31 nM vs. Bf = 60-61 nM (p = 0.936 for BM and p = 0.302 for LM); Bf = 92-107 nM vs. Bf = 142-150 nM (p = 0.791 for BM and p = 0.342 for LM); or BM vs. LM at any range of Bf (p = 0.086, p = 0.372, p = 0.298, p = 0.605, respectively).