the ability of cultured normal human fetal liver and kidney epithelial cells to repair the premutagenic and precarcinogenic o6-methylguanine ( o6-megua ) dna adduct was determined by directly monitoring its loss in cellular dna and quantitating the number of o6-megua-dna-methyltransferase ( o6-mt ) molecules per cell .
C0242958
dna
C0012854
dna