 The exon portion of a DNA strand encodes a specific portion of a protein. In some organisms exons are situated between introns which are spliced from the strand before it is exported from the nucleus and do not code for protein parts. Exons are the regions of DNA within a gene that are not spliced out and which are retained in the final mRNA molecule. In many genes, each exon codes for a specific portion of the complete protein, however, not all exons in a given gene will end up in the final protein due to the process of alternative splicing. Some mRNA transcripts have no exons whatsoever and thus are sometimes referred to as non-coding RNA.
Exon trapping is a molecular biology technique that exploits the existence of the intron-exon architecture to find new genes.
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