Fig. 1
From: Boolean factor graph model for biological systems: the yeast cell-cycle network
a Simple directed gene graph with \(n=4\). b Equivalent undirected factor graph representation of (a). The state of gene \(x_{i}\) at time \(t+1\) is governed by Boolean function \(f_{i}\), given a set of interacting genes. For instance, \(x_{3}(t+1)= f_{3}(x_{2}(t), x_{3}(t), x_{4}(t))\). Red blunt edges indicate inhibition links, whereas black arrowheads represent activation interactions