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Medical Definition of Immunologic capping
1. The process by which lymphoid cell surface immunoglobulin receptors, when exposed to bivalent anti-ig antibodies, collect in patches and form a cap at one pole of the cell. The caps may then be endocytosed or shed into the environment in the form of antigen-antibody complexes. Capping has also been induced by lectins and antigens. (12 Dec 1998)