Figure 3
From: Stochastic Boolean networks: An efficient approach to modeling gene regulatory networks
An SBN with perturbation. A perturbation network is implemented by the stochastic XOR logic of the perturbation vector and the present state. The probability that either a Boolean function works or a perturbation works is given by the output sequence of a stochastic n-input OR gate, which in turn determines the selection of a BN (without perturbation) or a perturbed network by a bus multiplexer.