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Definition of Common acute lymphocytic leukemia antigen

Common acute lymphocytic leukemia antigen: (CALLA) A cell surface enzyme with neutral metalloendopeptidase activity that serves as a marker for the common form of ALL (acute lymphocytic leukemia) as well as for Burkitt lymphoma and follicular germinal center lymphoma. CALLA is normally present on the surface of early lymphoid cells as well as on a number of other types of normal cells, such as especially cells in the kidney.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=39568
Last Editorial Review: 10/9/2012

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