Polypyrimidine Tract-Binding ProteinRNA-Binding ProteinsRibonucleoproteinsAlternative SplicingHeterogeneous-Nuclear RibonucleoproteinsRNA PrecursorsHeterogeneous-Nuclear Ribonucleoprotein Group F-HRNA SplicingExonsMolecular Sequence DataEncephalomyocarditis virusBase SequenceIntronsHeLa CellsTropomyosinProtein IsoformsRNA, MessengerProtein Binding5' Untranslated RegionsBinding SitesRibosomesProtein BiosynthesisNucleic Acid ConformationGene Expression RegulationAmino Acid SequenceCell LineDNA-Binding ProteinsCell NucleusNuclear ProteinsMutationRNA Splice SitesPyrimidinesSpliceosomesHeterogeneous-Nuclear Ribonucleoprotein Group CRNA, Viral