When checking the quality score for my trimmed 16s pair-end reads, I found QC dropping to 25 at the very beginning. Though I’ve noticed this type of dropping previously but none has dropped below QC of 30. Should I be concerned about this? If so, any suggestions on what I shall do?
Thanks in advance!
16s_reads_trimmed_joined_filt_summary.qzv (305.7 KB)