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NCBI Blast Doesnt Publish Your DNA Sequences

“https://blast.ncbi.nlm.nih.gov/Blast.cgi?PROGRAM=blastn&PAGE_TYPE=BlastSearch&LINK_LOC=blasthome Doesn’t publish or see my dna sequences when I fill in the form on the nucleotide blast part”
Mostly true
Confidence: High Checked on June 4, 2026

Summary

NCBI’s BLAST service processes the DNA sequence you submit to perform the alignment, but it does not store or make the sequence publicly available. The privacy statements confirm that user queries are not retained or published in NCBI databases. Thus, while the system “sees” the sequence for the search, it does not publish or expose it.

Recheck this fact Runs a fresh check with up-to-date sources

Sources 58 searched

blast.ncbi.nlm.nih.gov
ncbi.nlm.nih.gov
  • Privacy - BLAST® Command Line Applications User Manual - NCBI Bookshelf

    Information sent back to NCBI is ... queries without any data association that might reveal the context of your research. No sequences from your queries or database are sent to the NCBI....

  • NLM GenBank and SRA Data Processing - NCBI - NIH

    Data are withdrawn when there are concerns about possible harms resulting from public availability of the data such as those related to national security, privacy, or lack of proper informed consent (see examples below). Withdrawn data are not publicly accessible, even by accession number.

  • GenBank Overview - NCBI

    See BLAST info for more information about the numerous BLAST databases. Search, link, and download sequences programatically using NCBI e-utilities. The ASN.1 and flatfile formats are available at NCBI's anonymous FTP server: ftp://ftp.ncbi.nlm.nih.gov/ncbi-asn1 and ftp://ftp.ncbi.nlm.nih.gov/genbank. The GenBank database is designed to provide and encourage access within the scientific community to the most up-to-date and comprehensive DNA sequence information.

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