IntronsRNA SplicingExonsBase SequenceRNA Splice SitesSpliceosomesMolecular Sequence DataRNA PrecursorsEvolution, MolecularPhylogenyNucleic Acid ConformationAmino Acid SequenceRNA, CatalyticAlternative SplicingGenesCloning, MolecularRNA, Small NuclearSequence Homology, Nucleic AcidSequence AlignmentConserved SequenceChlorophytaBiological EvolutionRNA, MessengerModels, GeneticNucleic Acid PrecursorsTranscription, GeneticSequence Analysis, DNAOpen Reading FramesRetroelementsRestriction MappingRNA, FungalSpecies SpecificityDNA Transposable ElementsGenes, PlantGenomeRNA, RibosomalSequence Homology, Amino AcidGenes, FungalDNABase CompositionPolymerase Chain ReactionDNA, MitochondrialRNA Processing, Post-TranscriptionalChromosome MappingChloroplastsDNA PrimersRNAPlantsGenes, InsectRepetitive Sequences, Nucleic AcidCodonPromoter Regions, GeneticDrosophila melanogasterMutationSaccharomyces cerevisiaeArabidopsisSequence DeletionCell NucleusRNA, BacterialEuglena gracilisReverse Transcriptase Polymerase Chain ReactionDNA, ComplementaryTrans-SplicingGenomic LibraryBlotting, SouthernCryptophytaRibonucleoproteins, Small NuclearAscomycotaRNA, Ribosomal, Self-SplicingRibonucleoprotein, U2 Small NuclearDNA, FungalTetrahymenaPseudogenesUntranslated Regions