we have made use of 2 alternative methodologies to obtain 3-way differential staining ( twd ) in third-mitosis ( m3 ) chromosomes of allium cepa , which involve different uptakes of bromodeoxyuridine ( brdu ) through 3 cell divisions , in order to evaluate the sister-chromatid exchanges ( sce ) frequency on a per-cell-cycle basis .
C0026255
mitosis
C0007590
cell divisions