Department of Health and Human ServicesNational Institutes of HealthNational Heart Lung and Blood Institute
IMCD Proteome Database
NHLBI Division of Intramural ResearchLaboratory of Kidney and Electrolyte Metabolism

Back to BLAST Search

NCBI BLAST Advanced Options

Full list of the BLAST Advanced options


BLASTN Program Advanced Options

  -G  Cost to open a gap [Integer]
    default = 5
  -E  Cost to extend a gap [Integer]
    default = 2
  -q  Penalty for a mismatch in the blast portion of run [Integer]
    default = -3
  -r  Reward for a match in the blast portion of run [Integer]
    default = 1
  -e  Expectation value (E) [Real]
    default = 10.0
  -W  Word size, default is 11 for blastn, 3 for other programs.
  -v  Number of one-line descriptions (V) [Integer]
    default = 100
  -b  Number of alignments to show (B) [Integer]
    default = 100



BLASTP Program Advanced Options

BLASTX Program Advanced Options

TBLASTN Program Advanced Options

  -G  Cost to open a gap [Integer]
    default = 11
  -E  Cost to extend a gap [Integer]
    default = 1
  -e  Expectation value (E) [Real]
    default = 10.0
  -W  Word size, default is 11 for blastn, 3 for other programs.
  -v  Number of one-line descriptions (V) [Integer]
    default = 100
  -b  Number of alignments to show (B) [Integer]
    default = 100


  Limited values for gap existence and extension are supported for these three programs.  
  Some supported and suggested values are:

  Existence	Extension

     10             1
     10             2
     11             1
      8             2
      9             2
     

Additional BLAST information is available from NCBI