Hepatic Myeloperoxidase Levels following I/R in Wild-type and P/I null mice. Mice were subjected to the sham operation or to 90 minutes of liver ischemia with various reperfusion times (i.e., 6, and 15 hrs). The ischemic liver was collected and its MPO content was determined for the reperfusion time points indicated. Values are expressed as the mean ± SEM. (*) Sham-operated mice were statistically different from the I/R groups (i.e., p ≤ 0.05). Comparison between Wild-type and P/I null at each time points indicated no significant differences.