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There are some standard microarrays for use in cancer research, such as the Lymphochip. Standard arrays include genes that have been reported as important in a certain type of cancer. Other arrays contain strands of DNA called single nucleotide polymorphisms, or SNPs ("snips"), which are common variations in DNA. Researchers also can create their own microarrays using whatever genes (or gene fragments) they think might be important to the questions they are trying to answer.
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