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The canonical microRNA (miRNA) pathway converts primary hairpin precursor transcripts into ∼22 nucleotide regulatory RNAs via consecutive cleavages by two RNase III enzymes, Drosha and Dicer. In this study, we characterize Drosophila small RNAs that derive from short intronic hairpins termed “mirtrons.” Their nuclear biogenesis appears to bypass Drosha cleavage, which is essential for miRNA biogenesis...
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