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RNA has multiple functions in nature, including informa- tional transfer (mRNA) Ill, adaptor function (tRNAs) [2], guide functions (snRNAs, snoRNAs) [3,4]catalytic func- tion (ribozymes and the large ribosomal RNA) [5-7], and environmental sensing (riboswitehes) [8].In contrast, DNA only serves as an information storage molecule, and proteins serve as structural and enzymatic molecules.