Figure 4. Lectin staining (red stain) for SAα 2,3-gal (avian influenza virus receptors) and SAα 2,6-gal (human influenza virus receptors) in canine trachea, bronchus, and bronchioles, together with porcine tissues as a positive control. Original magnification all x300. −, no staining; ±, rare or few positive cells; +, moderate numbers of positive cells; and ++, many positive cells.
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