Exitrons (exonic introns) are produced through alternative splicing and have characteristics of both introns and exons, but are described as retained introns. Even though they are considered introns, which are typically cut out of pre mRNA sequences, there are significant problems that arise when exitrons are spliced out of these strands, with the most obvious result being altered protein structures and functions.
Exitrons (exonic introns) are produced through alternative splicing and have characteristics of both introns and exons, but are described as retained introns. Even though they are considered introns, which are typically cut out of pre mRNA sequences, there are significant problems that arise when exitrons are spliced out of these strands, with the most obvious result being altered protein structures and functions.
Source: Wikipedia "Exitron" · CC BY-SA 4.0
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