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May 22, 2013
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Definition of M protein

M protein: An antibody or part of an antibody found in unusually large amounts in the blood or urine of patients with multiple myeloma, a form of cancer that arises in plasma cells (white blood cells that produce antibodies).

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4230
Last Editorial Review: 4/27/2011 5:27:15 PM

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