The hemagglutinin (HA) protein attaches viral particles to host cells by binding to sialic acid-containing receptors and induces viral particle internalization through clathrin-dependent endocytosis.HA also promotes an alternative clathrin- and caveolin-independent pathway for some virions.HA/Hemagglutinin Protein, H1N1 (ABP49481, sf9, His) is the recombinant Virus-derived HA/Hemagglutinin protein, expressed by Sf9 insect cells , with C-His labeled tag.
