the study of the combined effect of viral dna fragments and the tumor promoter 12-o-tetradecanoylphorbol-13-acetate ( tpa ) which increases the transforming activity of different carcinogens , shows that the promoter increases the frequency of mutants after viral oncogene treatment and does not induce mutagenic activity of those types of dna which are unable to transform the cells .
C0012939
viral dna
C0012854
dna