Term: intron https://doi.org/10.1351/goldbook.I03141 Definition: An intervening section of DNA occuring almost exclusively within a eukaryotic gene but which is not translated to amino acid sequences in the gene product. The introns are removed from the premature mRNA through a process called splicing to form an active mRNA. Related Terms: 1) dna (http://doi.org/10.1351/goldbook.D01597). 2) gene (http://doi.org/10.1351/goldbook.G02604). 3) mrna (http://doi.org/10.1351/goldbook.M03857). 4) splicing (<em>of rna, of dna</em>) (http://doi.org/10.1351/goldbook.S05885). Source: PAC, 1992, 64, 143. 'Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)' on page 158 (https://doi.org/10.1351/pac199264010143) Citation: 'intron' 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.I03141 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.