Cover: Micrograph showing Ia⁺ dendritic cells in tracheal whole mounts from normal, pathogen-free rats. Immunoperoxidase staining with the OX-6 (anti-Ia) antibody. Cells were photographed using differential interference contrast optics. Whole mounts viewed from the luminal surface. Ia⁺ cells in the mucosa overlying a cartilage ring. Each cell has three to five branched cytoplasmic processes.
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