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  • Title: Isolation and characterization of a monoclonal antibody-resistant antigenic mutant of Toxoplasma gondii.
    Author: Kasper LH, Crabb JH, Pfefferkorn ER.
    Journal: J Immunol; 1982 Oct; 129(4):1694-9. PubMed ID: 7108224.
    Abstract:
    Several monoclonal antibodies against Toxoplasma gondii were parasiticidal in the presence of normal human serum as measured by reduction in plaque titer or in assays that detected lysis. One monoclonal antibody, G, was used to select a resistant mutant from a large population of chemically mutagenized wild-type parasites. This mutant retained the wild-type sensitivity to other monoclonal antibodies and to polyclonal antisera. A comparison of surface radioiodinated wild-type and mutant parasites by using one and two-dimensional electrophoresis showed that the mutant lacked a protein (or proteins) of approximate m.w. 22,000. An immunoprecipitation procedure using monoclonal antibody G yielded a protein(s) of this m.w. from surface radioiodinated wild-type T. gondii but not from surface radioiodinated mutant parasites.
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