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Detection of Mx2 protein in IFN-treated peritoneal macrophages from feral mouse strains by immunofluorescence with the anti-Mx monoclonal antibody 2C12 as described previously (3). The cells shown are from the influenza virus-resistant strain SL/NiA (a), wild-type strain SPR (b), wild-type strain NJL (c), and susceptible strain C57BL/6 (d). All cells were treated with 500 IU of IFN-α/β per ml for 18 h.
