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Secondary structure of H.volcanii SRP RNA. Helices are numbered from 1 to 8 starting from the 5′-end. Numbering of residues is in increments of 10, as indicated by dots and numbers. Watson–Crick paired residues are connected by lines and G–U interactions by circles. A phylogenetically supported tertiary interaction (ter) between the loops of helices 3 and 4 is indicated.
