Type | Site | URL | Features |
---|---|---|---|
TYPE 1: extract relationships and allow for 1) graphical visualization or navigation; or 2) refining queries | AliBaba [15] | Extract relationships between biological objects and map them into a graphical network | |
 | BioIE [16] | Extract informative sentences from retrieved results | |
 | Chilibot [17] | Extract biological relationships from search results | |
 | ConceptLink [18] | Extract relationships between medical concepts and allow graphical visualization | |
 | PubNet [29] | Extract several relationships from the search results and then map them into networks | |
 | XplorMed [20] | Extract dependency relations among words and allow users to refine queries using these words | |
TYPE 2: organize results by ontologies or hierarchies | GoPubMed [21] | Sort PubMed query results through Gene Ontology and MeSH hierarchy | |
 | MEVA [22] | Summarize search results according to MeSH hierarchy | |
 | FABLE [23] | Tag gene and protein occurrences in text | |
 | PubReMiner [24] | Categories include words, MeSH, authors, journals, year, substances and country | |
 | PubMed Assistant [25] | Lists MeSH and chemicals, with link-outs to PubMed, Google and Google Scholar | |
TYPE 3: cluster articles into categories | VivÃsimo ClusterMed [26] | Cluster articles into several categories | |
 | HubMed [27] | Cluster related articles and allow for graphical visualization | |
TYPE 4: rank articles | PubFocus [28] | Rank articles by the journal impact factor and volume of forward references | |
 | ReleMed [29] | Rank articles by relevance |