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Effects of exposure to 1,2,3,4-diepoxybutane (DEB) on colony formation and survival of V79 (circles), V-H1 (squares) and V-H4 (diamonds) cells. The influence of exposure to various concentrations of DEB for 3 h on colony forming activity (A, clonogenic assay), and survival (B, direct cell counting of trypan blue-excluding cells) was determined as described in the Methods section. Results represent average ± the standard error of the mean (SEM), n = 3 or more. * p < 0.05.
