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Question: dna microarray analysis of the patterns of of mrna abundance...

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  • DNA microarray analysis of the patterns of of mRNA abundance in different human cell types shows that the level of expression of almost every active gene is different. The patterns of mRNA abundance are so characteristic of cell type that they can be used to determine the tissue of origin of cancer cells, even though the cells may have metastasized to different parts of the body. Cancer cells are different than their non cancerous precursor cells. How do you suppose then that the patterns of mRNA expression might be used to determine the tissue source of a human cancer?
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