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. 2008 Nov 25;105(49):19165–19170. doi: 10.1073/pnas.0810366105

Fig. 2.

Fig. 2.

Nullclines, flow field, fixed points, and probability distributions. Plots of strong repression, for the cases of toggle switch with monomer binding, toggle switch with dimer binding and the exclusive switch. Strong repression is necessary for bistability. The exclusive switch shows a bimodal distribution even for the case of monomer binding, which has only one stable fixed point.