About this site

NCBI BLAST - Nucleotide Database Query

STEP 1 - Select your databases

STEP 2 - Enter your input sequence

(FASTA format recommended.)

STEP 3 - Set your parameters

Search program
BLASTN (search nucleotide databases using a nucleotide query.)

TBLASTN (search translated nucleotide databases using a protein query. )

TBLASTX (search translated nucleotide databases using a translated nucleotide query.)
Number of search results
scores will be reported:

alignments will be reported:
Advanced settings:
Filter query sequence (DUST with blastn, SEG with tblastn)

Perform gapped alignment

Expectation value