we have approached the study of the ability of different types of lesions produced by dna-damaging agents to develop sister-chromatid exchanges ( sces ) by analyzing sce levels observed in allium cepa l cells with brdu-substituted dna and exposed to visible light ( vl ) , an irradiation which produces uracil residues in dna after debromination of bromouracil and enhances sce levels but only above a certain dose .
C0037211
sister-chromatid exchanges
C0007634
cells