hl and v79 cells were treated for 2 h with 20 , 50 , 100 and 200 micrograms/ml of nnk with and without application of metabolic activation s-9 mixture , and subsequently incubated for two rounds of replication in the presence of 5-bromodeoxyuridine required for sce visualization .
C0007634
cells
C0037211
sce