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Virus protein levels determined by Western blotting. Lysates of mock-infected cells (lane 1) or cells infected with R-SW/FJ/03 (lane 2), SW/FJ/01-03NS (lane 3), R-SW/FJ/01 (lane 4), or SW/FJ/03-01NS (lane 5) were incubated with rabbit anti-NS1 antiserum, a mouse monoclonal antibody to the viral M1 protein, or β-actin antiserum.
