T7 promoter containing Alu expression plasmid was linearized and used for generating in vitro transcribed Alu RNA using AmpliScribe T7-Flash Transcription Kit (Epicenter) following the manufacturer’s instructions. The resulting Alu RNA was DNase treated and purified using MEGAclear (Ambion), and its integrity was monitored by gel electrophoresis4 (link),5 (link).