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The discovery of a SerieS of intron-encoded small nucleolar RNA(SnoRNA)has been a great progress in molecular biology since the 19905.It has not only oPened the way to expounding the complex Processing system and mechanism of rRNA from eukaryote,but also shown great signifi-cance to understanding all一sidely gene structure,organization and new mechanism of gene exPres-sion in eukaryote[1,2」.
The discovery of a SerieS of intron-encoded small nucleolar RNA (SnoRNA) has been a great progress in molecular biology since the 19905. It has not only oPened the way to expounding the complex Processing system and mechanism of rRNA from eukaryote, but also shown great signifi-cance to understand all one sidely gene structure, organization and new mechanism of gene exPres-sion in eukaryote [1,2].