It could also be rRNA; what does the GC plot (per sequence GC content) look like?
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The problem that you describe in the first few bases is often seen with RNA-Seq data,
and is thought to be due to the random priming being not so random in practice.
This has previously been disussed in various threads, one of which is here:
Application of sequencing to RNA analysis (RNA-Seq, whole transcriptome, SAGE, expression analysis, novel organism mining, splice variants)
The trimmomatic adapter trimming only trims adapter sequences from the 3' ends of the reads.
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