It is true that An exon is considered as the coding sequence of the dna, and its information is retained in the processed of mRNA within the cell.
The sequence was of DNA present in the mature messenger the RNA, some of which the encodes the amino acids of the protein. Most of the genes have the multiple exons with the introns between them. introns are the noncoding sections of an RNA transcript, or the DNA encoding it, that are also spliced out before the RNA molecule which is translated into the protein. The sections of the DNA (or RNA) that code for the proteins are called as exons.
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