Video of live cell imaging of SIR-DNA dye recording the first mitotic division in Smc3Δ/Δ cKO zygotes. Related to Fig. 4C-E. Left panel shows the SIR-DNA channel and the right panel shows the merged stack of the SIR-DNA channel (magenta) and the widefield channel (cyan). The magenta arrow indicates the micronucleus formed from lagging chromosomes. Scale bar, 10 μm.