The isolation and characterization of lymph node macrophages (M phi) has shown a hitherto unknown heterogeneity. Two types of M phi were distinguished by morphology, monoclonal antibody staining and functional assays. The type I M phi failed to express surface Ia even when activated, a characteristic which has only previously been reported for splenic marginal zone M phi; despite studies suggesting an antigen presentation role for the M phi, the failure to express surface Ia would seem to eli...Expand abstract
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Lymph node macrophage heterogeneity: the phenotypic and functional characterization of two distinct populations of macrophages from rat lymph node.
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