Tumor cells from a person with leukemia have been analyzed to determine which oncogene is involved in the transformation. After partial sequencing of the gene, the predicted gene product is identified as a tyrosine kinase. Which of the following proteins would most likely be encoded by an oncogene and exhibit tyrosine kinase activity?   A. Nuclear transcriptional activator   B. Epidermal growth factor   C. Membrane-associated G protein   D. Platelet-derived growth factor   E. Growth factor receptor

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