RefSeq: NCBI Reference Sequence Database
A comprehensive, integrated, non-redundant, well-annotated set of reference sequences including genomic, transcript, and protein.
RefSeq Access
Announcements
May 19, 2026
RefSeq Release 235 is available for FTP
This release includes:
- Proteins:
- 473,570,961
- Transcripts:
- 81,124,747
- Organisms:
- 180,620
- Available at:
- https://ftp.ncbi.nlm.nih.gov/refseq/release/
- Documentation:
- Release Notes
See previous announcements or subscribe to NCBI's refseq-announce mail list to receive announcements.