NCI Dictionary of Genetics Terms
Welcome to the NCI Dictionary of Genetics Terms, which contains technical definitions for more than 150 terms related to genetics. These definitions were developed by the PDQ® Cancer Genetics Editorial Board to support the evidence-based, peer-reviewed PDQ cancer genetics information summaries.
- listen (IN-tron)
of DNA in between exons that is initially copied into RNA
but is cut out of the final RNA transcript and therefore
does not change the amino acid code. Some intronic
sequences are known to affect gene