GENETICS & HEREDITY A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site intron A portion of messenger RNA (mRNA), as transcribed from the DNA of a eukaryote, which is removed by enzymes before the mRNA matures and is transplanted into protein. The portions of mRNA that remain after the excision of the introns are known as exons. Related category    • GENETICS AND HEREDITY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP