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. 2012 Dec 18;7(12):e51822. doi: 10.1371/journal.pone.0051822

Figure 1. Taxonomy of PDS components and reactions.

Figure 1

A) In the taxonomy of PDS components there are four representation levels. The highest level (level 0) is the most abstract level, while the lowest one (level 3) represents single molecules. B) In the taxonomy of PDS reactions individual reactions are represented at the lowest level (level 2) and are grouped according to their functionality into three groups at level 1: Activation (A), Binding (B) and Inhibition (I).