(f) Liver function tests of the mice used in d. The serum levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase (ALP) were measured. (IU/L, international unit per liter). Data are means ± s.d. for seven mice from each group. Asterisk, P 0.05; three asterisks, P 0.001. 