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Immunohistochemistry (IH-myoo-noh-HIS-toh-KEH-mih-stree)

A laboratory test that uses antibodies to test for certain antigens in a sample of tissue. The antibody is usually linked to a radioactive substance or a dye that causes the antigens in the tissue to light up under a microscope. Immunohistochemistry is used to help diagnose diseases, such as cancer. It may also be used to help tell the difference between different types of cancer.

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