Figure 3.

An example illustrating the sets Pϕ(r) and P(r). A bipartite graph showing reactions r1, r2, r3 and compounds c1, c2, c3. The transition from r1 to r2 can be made by using pathway b but the transition from r2 to r3 requires a switch from pathway b to one of the pathways d,e,f.

Lim and Wong BMC Bioinformatics 2012 13(Suppl 17):S17   doi:10.1186/1471-2105-13-S17-S17