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Expression cloning of the MMTV receptor. (A) Virus binding to NMuMG, Cos-7, and 44T(MTVR)- and osteopontin-transiently transfected Cos-7 cells. (B) Virus binding to NMuMG and MTVR- and ApoD-stably transfected CV1 cells. (C) Anti-44T antibody blocking of binding to NMuMG cells. A 1:600 dilution of immune (+ab) or preimmune (+PI) serum was used.
