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Domain structure of U11/U12-associated proteins. (A) Novel U11/U12 proteins are shown schematically with their number of amino acids (aa) at the right. (B) Comparison of the domain structure of U11/U12-65K with U1-A and U2-B″, U11/U12-35K with U1-70K, and U11/U12-20K with U1-C. RRM indicates RNA recognition motif; ZF, zinc finger; and Pro, proline-rich.
