exonListen to pronunciation(EK-son)The sequence of DNA that is present in the final, mature messenger RNA transcript. Most exons code for amino acids, which link together to form a protein. Most genes are made up of many exons with introns in between them.More InformationExon (National Human Genome Research Institute)Definition of: intronSearch NCI's Dictionary of Genetics TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#