c("cell line: HEK293", "sirna: none", "fragmentation: alkaline hydrolysis")
c("cell line: HEK293", "sirna: scrambled-A", "fragmentation: alkaline hydrolysis")
c("cell line: HEK293", "sirna: Ambion S224836", "fragmentation: alkaline hydrolysis")
c("cell line: HEK293", "sirna: Ambion S21772", "fragmentation: alkaline hydrolysis")
c("cell line: HEK293", "sirna: scrambled-A", "fragmentation: RNase I digestion")
c("cell line: HEK293", "sirna: 5'-NNGACCGAGA UUACAUGGAUA-3' dsRNA oligo from Dharmacon", "fragmentation: RNase I digestion")