Figure 1

Theoretical DNA distributions of BrdUrd-labelled cells vs . cell number at different post-labelling times. A – immediately after BrdUrd pulse, i.e. at t = 0, B – at 0 < t <, C – at < t < T_S and < t < + , and D – at + < t < T_S. , T_S and are durations of G₁, S and G₂ phases of the cell cycle, respectively. Horizontal lines dividing G₁ ^ld and S^ld bars indicate that half of the labelled divided cells are excluded from calculations.