Contact Us

NCBI Help Desk

Send a message via the NCBI Support Center.

  • Submit questions about NCBI and its programs and services
  • Request technical support for our data or services

PubMed Customer Service

PubMed Central (PMC) Customer Service


  • Submit technical questions on running or interperting BLAST sequence comparison searches

GenBank Help

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

GenBank Submissions

  • E-mail completed Sequin submission files

Sequence Submission Help

  • Assistance with record annotation

Gene and Reference Sequences (RefSeq) Feedback

National Center for Biotechnology Information
National Library of Medicine
8600 Rockville Pike
Bethesda, MD USA 20894