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Contact Information

To obtain further information about any of our databases, services, or programs, contact NCBI:

PubMed Customer Service:

  • Send an Email for help with technical issues, searching, or content assistance
  • Call 1-888-FIND-NLM (1-888-346-3656) for help with searching or content assistance only

General Information:

  • Questions about and technical support for NCBI and its programs and services


  • Technical questions on running or interperting BLAST sequence comparison searches

GenBank Help:

  • Comments or questions about a sequence
  • E-mail simple updates to submissions
  • E-mail a completed update prepared with Sequin

GenBank Submissions:

  • E-mail completed Sequin submission files

Entrez Gene and Reference Sequences (RefSeq)

Postal Address:

National Center for Biotechnology Information
National Library of Medicine
Building 38A
Bethesda, MD 20894


Detailed directions to the NLM and NIH campus are available. The NCBI is located in the Lister Hill building.

Revised: November 18, 2009.

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