Polypyrimidine Tract-Binding ProteinRibonucleoproteinsRNA-Binding ProteinsHeterogeneous-Nuclear RibonucleoproteinsRNA PrecursorsRNA SplicingAlternative SplicingHeterogeneous-Nuclear Ribonucleoprotein Group F-HExonsEncephalomyocarditis virusIntronsBase SequenceMolecular Sequence DataHeLa CellsTropomyosin5' Untranslated RegionsPyrimidine NucleotidesProtein BindingPyrimidinesRNA, MessengerBinding SitesRibosomesProtein BiosynthesisNucleic Acid ConformationRibonucleoprotein, U2 Small NuclearDNA-Binding ProteinsGene Expression RegulationCell NucleusCell LineAmino Acid SequencePoly ANuclear ProteinsRNA, ViralMutationPyrimidine DimersPoly(A)-Binding ProteinsRNA Splice Sites