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The secondary structure of P and MRP RNAs from D. discoideum. Conserved nucleotides are found along the entire sequence of P RNA and MRP RNA. The 5′ ends of the sequences are denoted with a small circle. The boldface letters represent the universally conserved regions (CR I to CR V). The nomenclature for these conserved regions (CRs) is that of (Chen and Pace 1997). Helix numbering follows their putative homology with bacterial structures (Haas et al. 1994).
