presence of 904 splice variants produced by the virus through a complex pattern of alternative splicing. Very few of these splice variants have been shown to be functional, a point that the authors raise in their paper.
::"An outstanding question is what roles the menagerie of novel RNAs play or whether they are spurious molecules generated by an overloaded splicing machinery."

Modes

Five basic modes of alternative splicing are generally recognized.
* Exon skipping or cassette exon: in this case, an exon

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