the mode of permeation of uracil , 5-fluorouracil , and orotic acid into cells has been investigated in four established cell lines ( novikoff rat hepatopma , p388 mouse leukemia , mouse l. , and chinese hamster ovary cells ) in attempts to assess the rate-determining step ( s ) in their incorporation into the nucleotide pool and nucleic acids .
C0041917
uracil
C0016360
5-fluorouracil