A scientist is studying post -transcriptional processing in human stem cells. He clones an unknown segment of DNA to express the gene in culture. However when he sequences the protein, he finds that one of the amino acids does not match the amino acid that would be predicted from the genetic code. After confirmations, he suspects that RNA editing has taken place. Which of the following is an example of RNA editing in humans?
A. Production of Calcitonin and Calcitonin related peptide from the same gene
B. Production of membrane bound (m Ig M) and secreted (s IgM) from the same gene
C. Increased expression of N-myc in Neuroblastoma cells
D. The production of apoprotein B48 from the transcript of apo B100 gene
E. Disappearance of globulin mRNA in response to heme.
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