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Structure of an E. gracilis box H/ACA RNA (GenBank accession no. AY572240). The conserved H and ACA motifs are shown boxed. The inset depicts a potential base-pairing interaction between stem structure II and LSU species 8. The dashed line highlights nucleotides absent from the smaller RT primer extension product generated from this RNA (see text). The arrow indicates the 3′-most nucleotide that anneals to the RT primer.
