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Immunohistochemical staining of respiratory tract samples from the aMPV/C strain BJ17-inoculated SPF chickens. Nasal turbinate (A), tracheae (C), and lung tissue (E) from a non-inoculated chicken displays no positive cells for aMPV/C antigen. Nasal turbinate (B), tracheae (D), and lung tissue (F) of a BJ17-inoculated chicken displays large amount of positive cells for aMPV/C antigen. Bars, 20 μm.
