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Fig. 4. Timing and variability of cell cycle phases. Cell cycle analysis was
performed on whole cycles of Dictyostelium cells expressing GFP-PCNA,
in asynchronous culture. (A) Distribution of cell cycle timing for
early S, late S and G2. (B) Frequency distribution of G2 variation
between sister cells, representing the time cells remain in G2 after their
sister has divided. Includes exponential fit. (C,D) Frequency
distributions of S variation between sisters, representing the time cells
remain in early (C) or late (D) S phase after their sister has finished
dividing. Random pair comparisons are shown on the right.