the spontaneous mutation rate to 6-mercaptopurine resistance , as calculated per day in cells with reduced dna replication rate , was comparable to that in normally dividing cells [ ( 1,2 +/- 0,3 ) x 10 ( -5 ) and ( 3,1 +/- 0,5 ) x 10 ( -5 ) per cell per day respectively ] .
C0007590
cells
C0007634
cell