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Serum alanine aminotransferase (ALT), aspartate aminotransferase (AST) and total bilirubin levels. Changes in serum ALT, AST and total bilirubin levels during the experimental period are demonstrated. Although serum AST levels did not differ between the two groups, total bilirubin and ALT levels were significantly higher in the DEN group than in the control group throughout the experimental period. DEN, diethylnitrosamine; W, weeks. *p<0.05 (unrelated t-test).
