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Do a BLAST search using the stable URL provided by NCBI.
program BLASTP, BLASTN, BLASTX, TBLASTN, or TBLASTX.
datalib Which database to search against.
sequence The sequence to search.
ncbi_gi TRUE/FALSE whether to give 'gi' identifier. Def FALSE.
descriptions Number of descriptions to show. Def 100.
alignments Number of alignments to show. Def 50.
expect An expect value cutoff.
matrix Specify an alt. matrix (PAM30, PAM70, BLOSUM80, BLOSUM45).
gap_existence Give a gap open penalty.
gap_extend Give a gap extension penalty.
gapped TRUE/FALSE for giving gapped alignments. Def TRUE.
filter "none" turns off filtering. Default uses 'seg' or 'dust'.
html TRUE/FALSE for html output. Def FALSE.
gcode Specify an alternate genetic code for (T)BLASTX.
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http://www.ncbi.nlm.nih.gov/BLAST/blast_overview.html
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