Molecules and Cells

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Fig. 1. The domain structures (RRM, RRMH, RS, and Zn) are denoted as shown in the lower box. Current names for SR proteins are SRSFs, but aliases are also indicated in the parenthesis. Among 12 core SR proteins, 6 (red letters) are reported to shuttle between nucleus and cytoplasm (shuttling SR proteins), whereas the others (black letters) have not been shown to have shuttling activity (non-shuttling SR proteins), as indicated in the upper box.
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