RNA Sequences corresponding to genomic regions which are retained in processed RNA (i.e., not spliced out).

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Why aren't introns found on the ends of pre-RNA?

We recently learned in genetics class that exons always cap the ends of nascent RNA. I have been trying to figure out the reason why introns can't instead be found on the ends instead of exons. The ...
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Is intron removal coordinated?

Are the introns present in a nascent rna molecule removed simultaneously or are they removed in some sort of sequential fashion or is removal completely random?