| http://www.w3.org/ns/prov#value | - HA is a lectin that mediates binding of the virus to target cells and entry of the viral genome into the target cell, while NA is involved in the release of progeny virus from infected cells, by cleaving sugars that bind the mature viral particles.[34] Thus, these proteins are targets for antiviral drugs.[35] Furthermore, they are antigens to which antibodies can be raised.
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