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A conserved heterodimeric protein complex that binds to the 5\' terminal cap structure m7G(5\')ppp(5\')N of nascent eukaryotic RNA polymerase II transcripts such as pre-mRNA and U snRNA. The consists of proteins known as CBP20 and CBP80, binds to cap structures in the nucleus, and is involved in pre-mRNA splicing, 3\'-end formation, and RNA nuclear export. [PMID:16043498]
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