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You can also configure other parameters.
Index algorithm (-a) — algorithm for constructing BWA index.
It implements three different algorithms:
- is — designed for short reads up to ~200bp with low error rate (<3%). It does gapped global alignment w.r.t. reads, supports paired-end reads, and is one of the fastest short read alignment algorithms to date while also visiting suboptimal hits.
- bwtsw — is designed for long reads with more errors. It performs heuristic Smith-Waterman-like alignment to find high-scoring local hits. Algorithm implemented in BWA-SW. On low-error short queries, BWA-SW. is slower and less accurate than the is algorithm, but on long reads, it is better.
- div — does not work for long genomes.
Number of threads (-t) — number of threads.
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