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iVar uses primer positions supplied in a BED file to soft clip primer sequences from an aligned and sorted BAM file. Following this, the reads are trimmed based on a quality threshold(Default: 20). To do the quality trimming, iVar uses a sliding window approach(Default: 4). The windows slides from the 5' end to the 3' end and if at any point the average base quality in the window falls below the threshold, the remaining read is soft clipped. If after trimming, the length of the read is greater than the minimum length specified(Default: 30), the read is written to the new trimmed BAM file.

Environment Modules

Run module spider ivar to find out what environment modules are available for this application.

System Variables

  • HPC_IVAR_DIR - installation directory