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1.3 Exons from different RNA<br />

molecules can be fused by Trans-<br />

splicing<br />

• The 5’ 5 <strong>splice</strong> <strong>site</strong> of one exon is not always<br />

joint to the 3’ 3 <strong>splice</strong> <strong>site</strong> of the exon.Some<br />

exons can be skipped,and a given exon is<br />

joint to one further downstream.<br />

• Trans-splicing(<br />

splicing( 反 式 剪 接 ): the process in<br />

which two exons carried on different RNA<br />

molecules can be <strong>splice</strong>d together. It occurs<br />

in most all the mRNAs of trypanosomes and<br />

all the mRNA of the nematode worms.

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