bloom 's syndrome ( bs ) lymphocytes , which are characterized by a high incidence of sister chromatid exchangs ( sce , 78.4 per cell ) , were treated with bifunctional -- ( mc ) and monofunctional -- ( m -- mc ) mitomycin c and 4-nitroquinoline-l-oxide ( 4nqo ) either singly or in combination with caffeine , and the effects of the chemicals on the frequency of sce and chromosome aberrations compared with that in normal lymphocytes .
C1519334
sister chromatid
C0007634
cell