degradom sequence lenght

Question

[Sam]

Dear All

I have some problem with degradom files, the sequence length in raw reads file is 50 base , but in clean reads file (after removing the 3' adaptor) , about 20% of reads still have 50 bp length. is it due to adapator contamination ?

Thanks

[natasha.sernova]

This post looks helpful, some links don’t work, so I added 2 new links

StarScan: scanning small RNA targets in lncRNA, circRNA, mRNA and pseudo genes from degradome sequencing data

https://academic.oup.com/nar/article/43/W1/W480/2467966

StarScan: a web server for scanning small RNA targets from degradome sequencing data

The StarScan web server is available at http://mirlab.sysu.edu.cn/starscan/. But the site doesn;t answer.

This post below discusses a proper read length:

read length of sequence