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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.
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