Figure 1.

A pathway-switching route crossing the glycolysis/serine pathway. A pathway switch occurs when an enzyme catalyzed reaction exist in a separate pathway from precursor reactions. In this example, the enzyme that catalyzes the reaction from Glycerate-3P to 3-Phosphonoexypyruvate does not exist in the glycolysis pathway.

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