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Why have the introns been retained<br />

in eukaryotes?<br />

1.The presence of the introns and the<br />

need to remove them, allows for<br />

alternative splicing which can<br />

generate multiple proteins from a<br />

single gene.<br />

2. Having the coding sequence of<br />

genes divided into several exons<br />

allows new genes to be created by<br />

reshuffling exon.

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