Table 1.

Document_distribution

A	PUBMED	BIOMED	QUERY EXPANSION
# OF RETRIEVED DOCUMENTS	33 408	29 782	84 629
# OF RELEVANT DOCUMENTS	1100	1100	1100
# OF RELEVANT_RETRIEVED DOCUMENTS	469	504	469

B	PUBMED	BIOMED	QUERY EXPANSION
# OF RETRIEVED DOCUMENTS	33 408	29 782	87 998
# OF RELEVANT DOCUMENTS	1933	1933	1933
# OF RELEVANT_RETRIEVED DOCUMENTS	607	584	689

Distribution of the documents retrieved by the different systems during A—the PPIs evaluation, and B—the PTMs evaluation. The query expansions mentioned in table A and B, respectively, relate to the keywords ‘phosphorylate’ and ‘binds + interacts + association’