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Glossary Term

beta-2-microglobulin     (BAY-tuh-2-MY-kroh-GLAH-byoo-lin)

A small protein normally found on the surface of many cells, including lymphocytes, and in small amounts in the blood and urine. An increased amount in the blood or urine may be a sign of certain diseases, including some types of cancer, such as multiple myeloma or lymphoma.