Non-coding exons can contain some regulatory elements that modulate the protein expression, such as enhancers, silencer, or small non-coding RNA.

Are exons non-coding regions?

The exons are the sequences that will remain in the mature mRNA. ... Thus, the exons contain both protein-coding (translated) and non-coding (untranslated) sequences. Also note that the transcription of all mRNAs begins and ends with an exon and introns are located between exons.

Are all exons coding regions?

While the exome refers to all exons within a genome, the coding region refers to a singular section of the DNA or RNA which specifically codes for a certain kind of protein.