BLASTN search (nucleotide versus nucleotide) against one or more isolates

Use this form to query a nucleotide sequence against a database of nucleotide sequences.

Note 1: BLASTN searches are hundreds of times faster than BLASTP or BLASTX searches. Therefore, unlike BLASTP, this form allows BLASTN searches against much broader taxonomic groups (e.g. all isolates in database).

Note 2: The Expect value (E) is a parameter that describes the number of hits one can "expect" to see by chance when searching a database of a particular size. Therefore, an E-value for a specific alignment from a single-strain database search will be different from the E-value returned from the all-strains database search.

Select one or more organisms to search

Start typing and select a single strain
OR start typing and select from the following taxonomic groups
Include all genomes Only include complete genomes

Specify custom search parameters (optional)

Enter your nucleotide sequence in FASTA format