∞ generated and posted on 2016.02.16 ∞
Protein-coding regions of those genes that contain introns.
In genes that possess introns, exons constitute the reading frame that is present once mRNA processing has been completed. Mostly such exon-possessing genes are found in eukaryotic cells, though there are some exceptions to this rule.
Figure legend: Removal of introns from mRNA reading frame. The larger arrow heads indicate the direction that the mRNA will pass through the ribosome during translation, though that will occur only once the introns have been removed and the mRNA otherwise matured. Note that mRNA reading frames generally will begin with start codons, pass through numerous sense codons, and end with one or more stop codons.
Associated concepts include , spliceosome, , , and .