Table 3.

Feature comparison among PESCADOR, iHOP, STRING and AliBaba.

Feature	PESCADOR	iHOP	STRING	AliBaba
Input	PubMed (user selection or query)	Protein/Gene ID	Protein/Gene ID	PubMed (query)
Biological concepts	Customized	Fixed	Fixed	Fixed
Literature corpus	Selected PubMed	Whole PubMed	Whole PubMed	Selected PubMed
Co-occurrence context	Sentence/whole abstract	Sentence	Whole abstract	Sentence
Target protein display filters	Biological concept; Biointeraction term; Co-occurring pair; Co-occurrence structure.	Co-occurring pair.	Co-occurring pair; Confidence; Degree.	Co-occurring pair; Confidence; Degree.
Manual validation of co-occurring pairs	Yes	Yes	No	No
Co-occurrence validation sharing among users	Yes	No	No	No
Network building	Automatically on-the-fly	Manually stepwise	Automatically on-the-fly	Automatically on-the-fly