Term: exon https://doi.org/10.1351/goldbook.E02268 Definition: A section of DNA which carries the coding sequence for a protein or part of it. Exons are separated by intervening, non-coding sequences (cf. intron). In eukaryotes most genes consist of a number of exons. Related Terms: 1) dna (http://doi.org/10.1351/goldbook.D01597). 2) intron (http://doi.org/10.1351/goldbook.I03141). 3) genes (http://doi.org/10.1351/goldbook.G02604). 4) sequence (http://doi.org/10.1351/goldbook.ST06775). Source: PAC, 1992, 64, 143. 'Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)' on page 153 (https://doi.org/10.1351/pac199264010143) Citation: 'exon' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.E02268 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.