Parallel structure. The left subfigure illustrate the general parallel structure. The right subfigure is an example from . The shaded areas are the simplified systems. Based on the simplification rules the virtual inhibitors on the simplified systems in this example target on the reactions B1-P+C→C-P (or it also could be seen as target on component B1-P) and B2-P+C→C-P (or target on component B2-P).