Hello, I want to trim adaptor sequences from my raw reads, the report data of the sequencer company details that adapters were not removed from the reads but do not detail the adapter sequence used, so I took a look to the library kit used and it was the Truseq DNA-PCR free kit from Illumina. then I went to the page https://support.illumina.com/bulletins/2016/12/what-sequences-do-i-use-for-adapter-trimming.html and it seems that I must use this sequence for trimming my paired-end reads:
Illumina DNA PCR-Free Prep, Tagmentation CTGTCTCTTATACACATCT+ATGTGTATAAGAGACA
I checked that "tagmentation" was part of the procedure.
with this, what does the "+" means in that sequence? which tool should I use for trimming those adapter sequences?
I saw that the above sequence must be used for both read 1 and read 2 of a paired-end run but how can I know if the adapters are on the 5´ end or 3´end of the respective reads? If helps the report data describes that in the library preparation procedure adapters were ligated 5´end and 3´end The read´s length is of 101pb for each read.