Four different mechanisms for switching cell polarity
Fig 8
A Power spectral density of A1(t)−A2(t) in the absence of any X signal for different noise strengths. A peak in the power spectrum at high noise indicates stochastic coherence. B The maximal power density relative to the power at zero frequency shows a non-monotonic dependence on the noise strength. C The mean time between switching events, defined as points when A1 = A2, varies as different signals are applied, at a noise level N = 103.75. Signals that generate deterministic oscillations have been excluded. Times between switches were extracted from stochastic trajectories with the signal applied continuously for 50000 min.