Reads longer than the small RNA molecule will sequence into the
adapter. For this reason, we recommend sequencing for only enough
cycles to cover the small RNAs of interest, or trimming the later
cycles before aligning. The sequence that would need to be trimmed
from the 3' end is given here for reference.
TGGAATTCTCGGGTGCCAAGGAACTCCAGTCACnnnnnnATCTCGTATGCCGTCTTCTGCTTG
This is the reverse complement of the index-specific primer sequence
given in the Illumina Adapter Sequences Document, with the
index sequence shown as nnnnnn.