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Fig. 7. Separase S1126A uncouples chromatid disjunction from mitotic exit. (A) GFP histone time-lapse analysis showing a normal mitosis in a WT separase cell. (B) Prolonged mitosis in a separase S:A cell, showing rapid chromatid disjunction followed by realignment of separated chromatids. (C) Separase S:A cell showing chromatid disjunction with unaligned chromosomes (arrow heads). (D) Quantitation of normal and abnormal mitoses in WT and separase S:A populations. (E) Bar graphs showing the time from nuclear envelope breakdown to metaphase and from metaphase to sister chromatid separation. Cells expressing WT separase are sub-divided into those that performed a normal mitosis (green), or an abnormal mitosis (blue), whereas all separase S:A cells are plotted together (red). Notice that metaphase in separase S:A cells is defined as the point prior to chromatid disjunction when most or all of the chromosomes have aligned.