Programs available for the BLAST search
The NCBI BLAST family of programs includes:
- blastp 
- compares an amino acid query sequence against a protein sequence 
database
 
- blastn 
- compares a nucleotide query sequence against a nucleotide sequence 
database
 
- blastx 
- compares a nucleotide query sequence translated in all reading frames 
against a protein sequence database
 
- tblastn 
- compares a protein query sequence against a nucleotide sequence database 
dynamically translated in all reading frames
 
- tblastx 
- 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.