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. 2010 Nov;16(11):2120–2130. doi: 10.1261/rna.2227710

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FIGURE 7. — A D. melanogaster ribosome gene and previously described rRNA processing pathways. (A) The primary rRNA transcript is drawn approximately to scale. (Solid boxes) Regions that are processed into mature rRNA. ETS (external transcribed spacer), ITS1 (internal transcribed spacer 1), and ITS2 (internal transcribed spacer 2) (open boxes) are removed during processing. Endonucleolytic cleavage sites are indicated by numbered marks (1–6). (B) The canonical and alternative rRNA processing pathways that have been previously described in D. melanogaster. Processing intermediates designated according to Long and Dawid (1980) are indicated by letters above each fragment.