Western blotting was performed with ALV-J envelope protein specific mouse anti-monoclonal antibody JE9 (kindly provided by Prof. Aijian Qin, Yangzhou University, Yangzhou, China), rabbit anti-β-actin antibody (Bioworld, Louis Park, MN, USA) and mouse anti-flag monoclonal antibody (Proteintech, Rosemont, CA, USA) according to our previously described method [26 (link)]. IRDye 800-conjugated anti-mouse IgG and IRDye 700DX-conjugated anti-rabbit IgG (Rockland Immunochemicals, Limerick, PA, PA, USA) were used as the secondary antibody. Results were visualized and analyzed with an Odyssey FC infrared imaging system (LICOR Biosciences, Lincoln, NE, USA).
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