Introns are found in the genes of most organisms and many viruses and can be present in both protein-coding genes and genes that function as RNA (non-coding genes).
protein-coding genes single gene or transcription unit can therefore encode multiple proteins or other gene products, depending on how the exons are joined. In fact, scientists estimate that there may be over 500,000 different human proteins, all encoded by just 20,000 protein-coding genes. According to the standard model, most RNA sequences are derived from protein-coding genes. That is, they way we and are processed into the messenger RNA (mRNA), exported to the cytosol, and then we translated into proteins.
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