Figure 4
From: Network analysis of metabolic enzyme evolution in Escherichia coli
Minimal path length (MPL) between enzymes. a) The reactions catalyzed by EC 1.1.1.1 (alcohol dehydrogenase), EC 1.5.1.12 (1-pyrroline-5-carboxylate dekydrogenase) and EC 1.2.1.3 (aldehyde dehydrogenase). b) There are severeral paths leading from EC 1.1.1.1 to EC 1.2.1.3. The shortest path goes from EC 1.1.1.1 through aldehyde to EC 1.2.1.3 and is of length 1 (MPL = 1).