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Production of filamentous influenza virus particles is dependent on the M2 cytoplasmic tail. MDCK-M2 (A and C) and MDCK-M2Stop70 (B and D) cells were infected at an MOI of 1.0, fixed at 12 h postinfection, and stained with antibodies specific for HA. Cells were infected with rWSN M1Ud M2Stop (A and B) or rUd M2Stop (C and D).
