Synthetic oligoribonucleotides were obtained from GE Healthcare Dharmacon (U30, Het30) or TriLink Biotechnologies, Inc. (ppp-Het30), dT30 was obtained from IDT, Inc. ss-dsRNAs were prepared by in vitro transcription as previously described22 (link). For RNAs containing 4-thiouridine, UTP was replaced with 4-Thio-UTP (TriLink Biotechnologies, Inc.) in the transcription reactions. All RNAs were purified by denaturing PAGE followed by electroelution in an Elutrap device (Schleicher and Schuell).
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