Pathogenicity of a mutant friend spleen focus-forming virus encoding an Env-like membrane glycoprotein (gp55) with substitution by a xenotropic murine leukemia virus Env gp70 sequence.

Abstract excerpt

Friend spleen focus-forming virus (F-SFFV) is a replication-defective acutely leukemogenic mouse retrovirus and encodes an envelope protein (Env)-like membrane glycoprotein (gp55) in its defective env gene, which is responsible for the early stage of the viral leukemogenesis. Gp55 is a modified Env protein and contains a polytropic mink cell focus-inducing (MCF) murine leukemia virus (MuLV) Env gp70-derived...

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