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.
Source:
PAC, 1992, 64, 143
(Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992))
on page 153