Introns are regions of DNA which are non-coding. They do not form part of the mature mRNA product and are spliced out during protein synthesis. Introns are only found in eukaryotic genes . They should not be confused with exons, which are the coding regions of DNA sequences.
- ↑ Alberts et al. (2008) Molecular Biology Of The Cell, 5th edition, New York: Garland Science.