SUMMARYTwenty-one monoclonal antibodies reactive with Junin virus structural proteins were produced and characterized. Using radioimmunoprecipitation and Western blot assays, 13 were found to react with the nucleoprotein, seven with the surface glycoprotein and one failed to react, but showed a fluorescent antibody staining pattern consistent with other glycoprotein-specific antibodies. In radioimmunoprecipitation assays, glycoprotein-specific monoclonal antibodies reacted not only with the 35K
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