Biologically Active Substance
exon Audio
ex·on [ ek-son ]
Subclass of:
Gene Components
Definitions related to exons:
  • The sequence of DNA present in mature messenger RNA, some of which encodes the amino acids of a protein. Most genes have multiple exons with introns between them.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • The sequences of a gene that are present in the final, mature, spliced messenger RNA molecule from that gene.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
  • The parts of a transcript of a split GENE remaining after the INTRONS are removed. They are spliced together to become a MESSENGER RNA or other functional RNA.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.