The cancer gene ras produces mRNA containing an extra exon that includes a number of UAA codons. Cancer cells produce ras mRNA missing this exon. This mistake most likely is due to a mistake by

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snRNPs are involved in the splicing process of pre-mRNA. A mistake by snRNPs could lead to improper splicing, resulting in the inclusion or exclusion of exons, such as the extra exon with UAA codons in the ras mRNA.

The Cancer Gene Ras Produces MRNA Containing an Extra Exon