cytotropic antibody test
Definition: a rosette test for macrophage cytotropic antibody: monolayers of macrophages are exposed first to antibody cytotropic for macrophages, then to the antigen (for which the antibody is specific), and indicator sheep erythrocytes; if the antibody is specific for sheep erythrocytes, the latter will form a rosette around the macrophages directly, but if not, and the antigen is soluble, the antigen must be coupled to the sheep erythrocytes by an agent such as bis-diazotized benzidine.
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