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Schematic diagrams of influenza virus-like particles (VLP). (A) Influenza VLP containing matrix protein M1 and hemagglutinin (HA). (B) Influenza VLP containing HA, neuraminidase (NA), and matrix protein M1. (C) Chimeric influenza VLP containing matrix protein M1, HA, and flagellin as molecular adjuvant. (D) Chimeric influenza VLP containing matrix protein M1, HA, and foreign antigens.
