Human alveolar macrophages: HLA-DR-positive macrophages that are poor stimulators of a primary mixed leukocyte reaction

Previous studies demonstrated that alveolar macrophages (AM) from most normal human volunteers failed to stimulate the antigen-induced proliferation of peripheral blood T lymphocytes although greater than 90% of AM expressed HLA-DR antigens. The current studies establish that AM also fail to induce...

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