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Tularemia. Immunohistochemistry of lymph node showing a stellate abscess with F. tularensis antigen-bearing macrophages in the central necrotic area using a mouse monoclonal antibody against the lipopolysaccharide of F. tularensis. (Immunoalkaline phosphatase with naphthol fast red substrate and hematoxylin counterstain; original magnification ×40.)
