(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 4. Cellular metabolism can be represented as a network. (A) Toy metabolic
reaction set. Network description of the reaction set: (B) connecting all
metabolites in a single reaction with undirected links; (C) substrates are
only connected to products with undirected links; and (D) same as in C with
directed links. (E) Bipartite network representation of the reaction set. (F)
Network with reactions as nodes, and reactions that share a metabolite as
eductproduct are connected.