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RRV glycoprotein-pseudotyped FIV vector transduces airway cells inefficiently following pulmonary delivery. Five mice were examined 2 weeks after nasal instillation of RRV/FIV vector. As indicated by red arrows, occasional cells along the conducting airways (A) and alveolar epithelium (B) were found to be β-Gal positive. Tissue sections were counterstained with nuclear fast red.
