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Box 1. Helpful E-Utility URLs and E-Utility Samples — The base E-Utility URL: eutils.ncbi.nlm.nih.gov/entrez/eutils EInfo (base/einfo.fcgi?) - provides overall statistics of a database, including a list of the indexed fields and available links to other Entrez databases EGQuery (base/egquery.fcgi?) - equivalent to Global Entrez; provides the number of records in each Entrez database that match a text query Example: base/equery.fcgi?term=interleukin+22 ESearch (base/esearch.fcgi?) - provides the number of records in a specified Entrez database that match a text query Example: base/esearch.fcgi?db=protein&term=srcdb+refseq[prop]+AND+human[orgn]+AND+protein+omim[filter]&usehistory=y ESummary (base/esummary.fcgi?) - provides Document Summaries for a set of UIDs from a specified Entrez database EFetch (base/efetch.fcgi?) - provides formatted data records for a set of UIDs from a specified Entrez database ELink (base/elink.fcgi?) - provides a set of UIDs in a specified Entrez database that are linked to an input set of UIDs in either the same [or a different] database Example: base/elink.fcgi?dbfrom=protein&db=gene&id=31317239&id=31317243&id=31317241&id=16418459&id=10092625 EPost (base/epost.fcgi?) - posts a set of UIDs in a specified Entrez database to the Entrez History server |