in synchronous cultures of p-815 murine mastocytoma and of chinese hamster ovary ( cho ) cells , the relative contribution of exogenous thymidine to dna synthesis was studied by comparing rates of ( 3h ) thymidine incorporation with the rate of dna synthesis as derived from incorporation of ( 3h ) thymidine ( 10 ( -5 ) m ) in the presence of amethopterin .
C0598312
dna synthesis
C0012854
dna