| http://www.w3.org/ns/prov#value | - The method is particularly useful wherein the virus is an Influenza virus that has been altered to modify a cleavage site in its hemagglutinin or to create a new cleavage site, preferably KKRKKR (SEQ ID No:4) or the like, in its hemagglutinin, and wherein the vertebrate cells are chosen from chicken embryo culture cells, VERO cells, CV-1 cells, LLC-MK2 cells, MDCK cells and MDBK cells as well as v
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