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- ArticleZiola BR, Matikainen MT, Salmi A.J Immunol Methods. 1977;17(3-4):309-17.Polystyrene balls have been incorporated as the solid-phase of a model double-antibody radioimmunoassay for human serum albumin. Purified IgG from the secondary antiserum is adsorbed on the 6.4 mm diameter balls. The solid-phase secondary antibody is then used to separate primary antibody bound iodinated antigen from unbound antigen. The secondary antibody coated polystyrene balls are easily prepared and manipulated; several hundred sample dilutions can readily be processed in a single assay. Assay background values of 1.5% or less are consistently obtained without extensive or special washing procedures.