The bold numbers in parentheses indicate number of genes evaluated for the molecular function. P values in bold represent effect of AZT on the molecular function, which is a combined effect of AZT-related changes in expression levels of number of genes evaluated for the molecular function. FC indicates a relative fold change in mice treated with 600 mg/kg/d AZT compared to vehicle-treated control mice. Negative values of fold changes indicate down-regulation of genes. Mitochondrial genes important in energy production, for which 600 mg/kg/d AZT did not alter transcription, are also presented in the table. Sex-related differences in the expression levels of mitochondria-related genes were not observed in liver of AZT-treated mice. NS: Not significant.