| http://www.w3.org/ns/prov#value | - Multitropic vectors can be prepared from such viruses as retroviruses wherein they contain in the virus envelope two or more compounds that are native to said virus such as the ecotropic env protein of MMLV and the amphotropic, polytropic or xenotropic env proteins of MMLV. Packaging of such a multitropic vector can be carried out by compositions described above.
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