blast/docs/blast_program.html
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<title>Programs available for the BLAST search</title>
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<h1 align="center">Programs available for the BLAST search</h1>
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The NCBI <b>BLAST</b> family of programs includes:
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<dt><b>blastp</b>
<dd>compares an amino acid query sequence against a protein sequence
database
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<dt><b>blastn</b>
<dd>compares a nucleotide query sequence against a nucleotide sequence
database
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<dt><b>blastx</b>
<dd>compares a nucleotide query sequence translated in all reading frames
against a protein sequence database
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<dt><b>tblastn</b>
<dd>compares a protein query sequence against a nucleotide sequence database
dynamically translated in all reading frames
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<dt><b>tblastx</b>
<dd>compares the six-frame translations of a nucleotide query sequence
against the six-frame translations of a nucleotide sequence database.
Please note that tblastx program cannot be used with the nr database on the BLAST Web page.
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