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Convergence of trajectories to the cell-cycle attractor. Trajectories are projected onto the three-dimensional space of 
with 
with X = (1u), and 
with X = (0p)(1u). See Appendix for the definition of X. (a) Five trajectories starting at C1 with random initial conditions (solid circles) are attracted to the cell-cycle attractor. (b) Under the constraint that extrinsic noise is absent, trajectories converge to the cell-cycle attractor to form a limit cycle.
