The sRNA
with 50 and 30 adaptors was reversely transcribed to cDNA
with the primer (CAAGCAGAAGACGGCATACGA)
using Superscript II reverse transcriptase (Invitrogen,
Shanghai, China). The cDNA was further purified by 15 %
TBU followed by dissolving in 100 lL 19 NEB (New
England Biolabs, Beijing, China). The cDNA was quanti-
fied by Agilent 2100 (Santa Clara, USA), and diluted to a
final concentration of 10 nM. A total of 18 ng cDNA was
loaded into the Illumina 1 G Genome Analyzer for
sequencing.