Download and export nucleotide sequences from NCBI database
| Accession ID | Sequence (first 50 bp) |
|---|
This tool fetches a contiguous range of NCBI accessions that share the same letter prefix and consecutive numeric suffixes (for example MN223758 through MN223767). Up to 25 sequences may be requested per run. Choose preview length and output format, then download.
MN), and the end number must be ≥ the start number. The tool expands the range into individual IDs (e.g. MN223758, MN223759, …).
Scope: This is range-based retrieval, not a paste-in list of arbitrary unrelated IDs. Use nucleotide accessions for DNA/RNA; protein IDs (e.g. NP_) return protein sequence. Very large individual records may be slow or fail; whole-chromosome scale is better handled outside the browser.
Both accessions must share the same leading letter prefix, and the numeric part of the end accession must be greater than or equal to the start. The tool builds every accession in numeric order between those bounds.
Each request is capped (typically 25 sequences) to stay within fair use of NCBI services and to keep the browser responsive. For larger batches, split the range into multiple requests or use NCBI’s bulk tools; for commercial-scale needs, use the contact email in the error message.
CSV suits spreadsheets; PDF for a single printable report; single FASTA for one multi-record FASTA file; separate FASTA or separate TXT when you need one file per accession.
No. This tool only accepts a single consecutive range with a shared prefix. For unrelated IDs, fetch them individually, use NCBI Batch Entrez, or another pipeline.
If you used protein accessions (for example NP_), NCBI returns protein sequence. For DNA or RNA, use nucleotide accessions (for example NM_, NC_, or MN as appropriate).