 livers from (**a**) untreated control mice, (**b**) 000 mg/kg APAP, (**c**) APAP + 00 mg/kg OTC, (**d**) APAP + 00 mg/kg OTC, (**e**) APAP + 000 mg/kg OTC, and (**f**) APAP + 000 mg/kg NAC. Original magnification = ×