2.5. In vitro synthesis of double-stranded dsRNA
The DNA templates were generated by PCR using primers containing the T7 promoter sequence at both ends. Then, the dsRNAs
were produced by in vitro transcription (TranscriptAid T7 High
Yield Transcription Kit, Waltham, MA USA). RNA was purified by
phenol–chloroform extraction, precipitated with ethanol, and then
dissolved in nuclease-free water.