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Genetic manipulations have revealed the functions of RNA helicases in ribosomal RNA (rRNA) biogenesis in yeast. However, no report shows the role of an RNA helicase in rRNA formation in higher eukaryotes. This study reports the functional characterization of the frog homologue of nucleolar RNA helicase II/Gu (xGu or DDX21). Down-regulation of xGu in Xenopus laevis oocyte using an antisense oligodeoxynucleotide results in the depletion of 18 and 28 S rRNAs. The disappearance of 18 S rRNA isdoi:10.1074/jbc.m302258200 pmid:12851405 fatcat:mxj2lzo6a5c6xoblggbqyrfq2q