the nitrosoureas 1-methyl-1-nitroso-3-phenylurea , 1-ethyl-1-nitroso-3-phenylurea , 1-methyl-1-nitroso-3- ( p-fluorophenyl ) urea , 1-methyl-1-nitroso-3- ( p-chlorophenyl ) urea , and 1-methyl-1-nitroso-3- ( p-bromophenyl ) urea , as well as their non-nitrosated parent compounds , were checked for induction of chromosomal aberrations and sister-chromatid exchanges in v79-e cells without metabolic activation in vitro .
C0037211
sister-chromatid exchanges
C0007634
cells