Influenza viruses assemble and bud from the apical plasma membrane of polarized cells e.g. lung epithelial cells of the infected host. This asymmetrical process (i.e. apical [Influenza virus] or basolateral [Marburg virus]) is thought to have an important role in viral pathogenesis and tissue tropism. In most cases the individual viral envelope proteins are seen to accumulate at the same polar surface from which virus budding occurs, suggesting that they determine the maturation site
Shaw, ML, Palese, P
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