Occurrence of terms in Medline, sorted by term length: The terms (baseforms and term variants) from the different resources have been matched against Medline.

<p>The results have been sorted according to the term length and are presented in logarithmic scale (cf. fig. 6). The left diagram counts all occurrences of a GP7 term in Medline. The term lists has been manually curated to remove senseless terms with high frequencies and all occurrences of a term in a single abstract has only been counted once (“unique terms”). A large portion of GP7 terms do contain ChEBI terms, and to a lower rate a disease or a species term. For the right diagram, every GP7 term has only be counted once across all Medline. It becomes clear that longer PGNs contain mentions of chemical entities, and also species and disease terms, which both may have shared polysemous terms (very similar distribution values).