Exons and introns are two types of nucleotide sequences found in DNA and RNA. Exons are the coding sequences that are conserved in the creation of mature RNA, while introns are non-coding sequences that are removed during the process of RNA splicing before the mRNA is translated into a protein
. In eukaryotic organisms, exons are present in mature mRNA, while introns are found in the initial RNA transcript and are removed before the mRNA is transported to the cytoplasm
. This process of removing introns and joining exons is known as RNA splicing
. Exons play a direct role in protein synthesis, while introns are involved in regulating gene expression and mRNA processing
