A Researcher Is Studying the Expression Pattern of a Particular

A researcher is studying the expression pattern of a particular gene.  Messenger RNA is isolated from several tissues, subjected to electrophoresis, blotted, and probed with radiolabeled DNA containing sequences from exon 4 from that gene.  An x-ray film is then placed over the blotting membrane, with the results of the autoradiogram shown below:
Which of the following best explains the autoradiogram findings in the different tissues?

A) Alternate RNA splicing
B) DNA rearrangement
C) DNA mutation
D) Enhancer effect
E) Transcription factor effect

Correct Answer:

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