Polypyrimidine Tract-Binding ProteinRNA-Binding ProteinsRibonucleoproteinsHeterogeneous-Nuclear RibonucleoproteinsRNA PrecursorsAlternative SplicingRNA SplicingHeterogeneous-Nuclear Ribonucleoprotein Group F-HExonsEncephalomyocarditis virusIntronsHeLa CellsBase SequenceMolecular Sequence DataTropomyosin5' Untranslated RegionsProtein BindingRNA, MessengerBinding SitesNucleic Acid ConformationRibosomesProtein BiosynthesisGene Expression RegulationDNA-Binding ProteinsCell NucleusCell LineAmino Acid SequenceNuclear ProteinsRNA Splice SitesPyrimidinesMutationSpliceosomesRNA, ViralHeterogeneous-Nuclear Ribonucleoprotein Group C