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Map of U2 RNA indicating positions of probe oligonucleotides (see Figures 6–8). The underlined sequence is the U2 coding region. The boxed sequence at the 3′ end of U2 represents preU2 tail that is removed in the cytoplasm. The box below the sequence map indicates the name of each oligonucleotide (color coded) and whether or not it detects RNA in CBs and/or splicing factor–rich speckles.
