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U21 is an intron-encoded snoRNA in vertebrates which contains a 13-nt tract of complementarity to an invariant sequence in eukaryotic 28S rRNA. Here, we report the characterization of its Drosophila melanogaster homolog which is the first case of an intron-encoded snoRNA in an invertebrate metazoan. In D. melanogaster, U21 is encoded within the ARF-1 (ADP ribosylation factor 1) gene, whereas in chicken...
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