I obtain my data from Ion Torrent,but when I use FASTX - Toolkit to exceut quality_filter ,some problem appeared,why ?anyone can help me?
fastq_quality_filter -q 20 -i PGM01.fastq -o test.fastq -v -Q 33
fastq_quality_filter: Invalid quality score value (char 'N' ord 78 quality value 45) on line 360
fastq_quality_filter -q 20 -i PGM01.fastq -o test.fastq -v -Q 33
fastq_quality_filter: Invalid quality score value (char 'N' ord 78 quality value 45) on line 360
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