The energy landscape of the yeast cell cycle network with finite volume effect.

<p>(A) on the <i>x</i>-<i>y</i> plane with <i>z</i> = 0 and (B) on the <i>y</i>-<i>z</i> plane with <i>x</i> = 0. The moving direction of the system is shown as brown arrows. Here we use “−ln(<i>P</i>)” to define the energy landscape of the system, where <i>P</i> = <i>P</i>(<b><i>x</i></b>) is the stationary probability distribution of the system from simulation. The “G1”, “S”, “early M” and “late M” in bold refer to G1 phase, S phase, early M phase and late M phase respectively.