Are All Exons Coding?

Are All Exons Coding? Are all exons coding? Even if most exons of a gene (which are regularly sequenced when doing whole exome sequencing or whole genome sequencing) are coding for protein, some of them may be non-coding. Do exons have non-coding regions? Thus, the exons contain both protein-coding (translated) and non-coding (untranslated) sequences. Are