BWA

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Application data

Created by Heng Li and Richard Durbin
Biological application domain(s) Read alignment, Mapping
Principal bioinformatics method(s) FM-Index
Technology Sanger, Illumina, 454, ABI SOLiD
Created at Sanger Institute
Maintained? Yes
Input format(s) compressed/uncompressed fastq/fasta
Output format(s) SAM
Software features Gapped alignment, paired-end mapping
Programming language(s) C
Licence GPLv3, MIT
Operating system(s) Unix

Summary: Fast, accurate, memory-efficient aligner for short and long sequencing reads

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Links


References

  1. . 2009. Bioinformatics


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Notes

Ambiguous bases in reference sequences

According to the BWA paper, "Non-A/C/G/T bases on the reference genome are converted to random nucleotides."

BWA uses a fixed seed for the random number generator. This means that running bwa index twice on the same FASTA file will result in the same index.

(The seed is set to 11 in bntseq.c.)

XT:A tag

N stands for for BWA_TYPE_NO_MATCH (bwtaln.h)


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