DuodenoscopyCrohn DiseaseClone CellsMolecular Sequence DataCloning, MolecularBase SequenceWorld HealthWorld Health OrganizationAmino Acid SequenceSequence Analysis, DNAWorld War IIPhylogenyDNA, ComplementaryDNAPolymerase Chain ReactionSpecies SpecificityRNA, MessengerCell LineSequence Homology, Nucleic AcidNucleic Acid HybridizationSequence Homology, Amino AcidGenetic VariationMutationChromosome MappingGenes