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Osteopontin expression in macrophages in SARS-CoV-infected African green monkeys. The same lung sections of SARS-CoV-infected African green monkeys were stained for expression of osteopontin (A) or CD68 (B), a marker for macrophages. The sections were stained with immunoperoxidase and counterstained with hematoxylin. Original magnifications, ×20.
