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The blast programs compare a given sequence (of amino acids or nucleotides) with all the sequences of a database using the statistical methods of Karlin and Altschul [Kar Al 90].

There are six blast applications: blastp, blastn, tblastn, blastx, tblastx and blast3 which were implemented at NCBIgif:

What is a six-frame translation? For our purpose it is enough, if we say, that it is the mapping of nucleotide sequences to amino acid sequences in 6 possible ways.

Blast3 exists in version 1.3, but not in 1.4, so we did not parallelize blast3.

Compte de groupe
Fri Jan 20 15:43:12 MET 1995