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Sequences of the two RNA duplexes Ψcomp (top) and ΨBP (bottom). ΨBP represents short sequences from the pairing of U2 snRNA (top strand) and the intron (bottom strand) from the yeast S. cerevisiae. The numbering scheme was that used in previous structure determination studies (Newby and Greenbaum, 2001, 2002a,b). The position of Ψ (Ψ6 in this sequence) corresponds to a phylogenetically conserved Ψ residue in U2 snRNA (Ψ35 in yeast). Ψcomp is a similar sequence without the bulged A.
