although all three cell lines showed a dose-dependent hypermethylation of dna , the extent of this methylation differed in the normal and transformed lines , as preexisting dna was more methylated in wi-38 cells compared with svwi-38 and ct-1 cells , while methylation of newly synthesized dna occurred to a greater extent in the svwi-38 cells .
C0000702
a
C0012854
dna