Fetch DNA & Protein Sequences by Accession (NCBI / UniProt)
Paste a GenBank, RefSeq or UniProt accession and get the FASTA or GenBank record.
🌐 Looks up public records — only the accession you enter is sent to NCBI / UniProt
Retrieve public DNA or protein records by accession number. Enter a GenBank/RefSeq ID (e.g. NM_000546) or a UniProt accession (e.g. P04637) and SeqBench retrieves the record from NCBI E-utilities or UniProt, shows the header and length, and lets you copy or download it as FASTA or GenBank. The lookup runs through SeqBench's server for reliability; only the public accession you enter is sent.
Examples:
How to use the Sequence Fetcher tool
- 1Type or paste an accession (e.g. NM_000546, NP_000537, P04637).
- 2Pick the database (or leave it on Auto-detect) and the output format (FASTA or GenBank).
- 3Click Fetch, then copy or download the record — or paste it straight into another SeqBench tool.
Frequently asked questions
- Which databases and IDs are supported?
- NCBI Nucleotide (GenBank/RefSeq IDs such as NM_, NR_, XM_, NC_ and classic accessions), NCBI Protein (NP_, XP_, YP_, WP_…) and UniProtKB accessions (e.g. P04637). Auto-detect picks the right database from the accession format, or you can choose it manually.
- Can I download GenBank format, not just FASTA?
- Yes. For NCBI records you can fetch either FASTA or the full GenBank/GenPept flat file with its annotations. UniProt is served as FASTA.
- Why does this tool use a server when everything else runs in my browser?
- Browsers block most cross-origin requests to NCBI and UniProt, and NCBI rate-limits by client. Routing the lookup through SeqBench's server makes it work reliably and lets us identify the requester per NCBI's policy. Only the public accession is sent — sequences you paste into other tools still never leave your browser.