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  • Title: Baboon virus isolate M-7 with properties similar to feline virus RD-114.
    Author: Hellman A, Peebles PT, Strickland JE, Fowler AK, Kalter SS, Oroszlan KS, Gilden RV.
    Journal: J Virol; 1974 Jul; 14(1):133-8. PubMed ID: 4134740.
    Abstract:
    A virus (M-7) isolated from baboon placental tissue demonstrates many similarities to endogenous feline virus RD-114. Immunodiffusion analysis shows a group-specific antigen (gs-1) line of identity between M-7 and RD-114. Anti-RD-114 DNA polymerase IgG inhibits M-7 polymerase by 57% compared to 97% for RD-114. M-7 virus has helper activity as demonstrated by rescue of murine sarcoma virus (MSV) from sarcoma-positive leukemia-negative human amnion cells. The host range of the rescued M-7 pseudotype of MSV, MSV (M-7), is similar to that of RD-114 virus. MSV (M-7) is also able to transform baboon cells and causes no detectable transformation of feline cells without addition of helper feline leukemia virus. Interference properties of M-7 and RD-114 virus are identical. Virus-specific neutralizing antisera, although partially cross-reacting, can distinguish MSV (M-7) from MSV (RD-114). These similarities and differences between RD-114 and M-7 viruses are best explained as type-specific differences between two viruses within the same strain.
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