Abstract
Three cell lines (HL60, U937 and RAW264.7) were studied for their sensitivity against mutagens by using a single-cell gel electrophoresis (comet) assay. RAW264.7, the most sensitive one, was chosen to screen the antimutagenic activity in swine and bovine offal. Aqueous extracts of the swine stomach (0.2 mg/ml) and heart (10 mg/ml) were found to have antimutagenic activity against MeIQx (+S9mix)-treated cells.