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This function returns the number of EBI database links associated with a publication.


epmc_db_count(ext_id = NULL, data_src = "med")



character, publication identifier


character, data source, by default Pubmed/MedLine index will be searched.


data.frame with counts for each database


Europe PMC supports cross-references between literature and the following databases:


Array Express, a database of functional genomics experiments


a database and ontology of chemical entities of biological interest


a database of bioactive drug-like small molecules


now ENA, provides a comprehensive record of the world's nucleotide sequencing information


provides a freely available, open source database system and analysis tools for molecular interaction data


provides functional analysis of proteins by classifying them into families and predicting domains and important sites


a comprehensive and authoritative compendium of human genes and genetic phenotypes


European resource for the collection, organisation and dissemination of data on biological macromolecular structures


comprehensive and freely accessible resource of protein sequence and functional information


PRIDE Archive - proteomics data repository


  if (FALSE) { # \dontrun{
  epmc_db_count(ext_id = "10779411")
  epmc_db_count(ext_id = "PMC3245140", data_src = "PMC")
  } # }