| http://www.w3.org/ns/prov#value | - The influenza virus in aqueous medium (water or low molarity buffer, pH 6.8-7.4), is then added under liposome forming conditions, such as agitation, e.g., bath sonication for from about 2 to about 8 minutes, to form positively charged liposomes to which the outer membrane of the virus is fused.
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