Evaluations were conducted on 5 subsections of each sample (n = 64) at 40× magnification. A hepatic activity score was used to evaluate hepatocyte inflammation, similar to methods described by Ishak et al. (1995): score 0 = no hepatocytes exhibiting gray pallor or swelling; score 1 = less than 50% of hepatocytes exhibiting gray pallor or swelling; score 2 = greater than 50% of hepatocytes exhibiting gray pallor or swelling (Figure 1).