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 of pre-mRNA, and a mistake in their function could lead to the incorrect removal or retention of exons, resulting in mRNA with or without certain exons.

The Cancer Gene Ras Produces MRNA Containing an Extra Exon