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The general secondary structures of 5S ribosomal RNA of Eukaryota (A) and Eubacteria (B). The numbering of the nucleotides corresponds to that in the multiple sequence alignments available from the database web pages. The positions of rare insertions are shown as black squares. The nucleotide symbols used in diagrams are according to IUBMB nomenclature. N: A, C, G or U; Y: C or U; R: A or G; W: A or U; S: G or C; M: A or C; K: G or U.
