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SARS‐CoV antigen in lung tissues from infected Macaca mulatta (No 1951) 10 days after infection. Lung tissue samples were stained using an avidin–biotin complex peroxidase technique. Sections were incubated with monoclonal antibodies against SARS‐CoV (1 : 400) and were developed using biotin‐labelled goat anti‐mouse antibody. (Immunohistochemical staining; original magnification ×400)
