the survival of asynchronous cells exposed to increasing concentrations of the drug was characterized by a threshold exponential curve ( do = 20 microgram/ml ; dq = 20 microgram/ml , 1 hour ) similar to that of other nitrosourea derivatives . cis-acid exerted its main killing effect on cells in early s and in late g2 phase .
C0007634
cells
C0079396
g2 phase