Entrez

[2] The NCBI is a part of the National Library of Medicine (NLM), which is itself a department of the National Institutes of Health (NIH), which in turn is a part of the United States Department of Health and Human Services.

The name "Entrez" (a greeting meaning "Come in" in French) was chosen to reflect the spirit of welcoming the public to search the content available from the NLM.

The Entrez system can provide views of gene and protein sequences and chromosome maps.

The Limits feature allows the user to narrow a search, a web forms interface.

The eUtils are accessed by posting specially formed URLs to the NCBI server, and parsing the XML response.