| http://www.w3.org/ns/prov#value | - The Bryan strain of the virus has a defect in the envelope (env) gene and therefore must be engineered to infect mammalian cells by one of the methods known in the art, such as by fusion of the viral and cellular membranes with inactivated Sendai virus, or by pseudotype formation whereby the env-defective Bryan virus would acquire the envelope protein from a nontransforming helper RNA tumor virus
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