the tumor promoter 12-o-tetradecanoyl-phorbol-13-acetate ( tpa ) does not increase the sister-chromatid exchange ( sce ) frequency in either chinese hamster ovary ( cho ) or lung ( v 79 ) cells which are cultured in the presence of 5-bromodeoxyuridine .
C0037211
sister-chromatid exchange
C0007634
cells