abts adsorption almond antibody antigen assay biochemistry bioconjugation blood plasma bovine serum albumin casein chromogenic complement fixation test coombs test counterimmunoelectrophoresis detergent diagnosis diagnostic immunology digital object identifier elispot enzyme epitope mapping eva engvall fluorescence fluorogenic food food allergy hiv test hemagglutination hemagglutinin immunoassay immunodiffusion immunoelectrophoresis immunofluorescence immunohistochemistry immunology immunoprecipitation lateral flow test latex fixation test magnetic immunoassay medical subject headings microtiter plate milk nephelometry ouchterlony double immuno diffusion peanut peroxidase plant pathology polystyrene quality control rast test radial immunodiffusion radioimmunoassay rosalyn sussman yalow secondary antibody secretion assay serology serum skin allergy test solomon berson standard curve university of arizona walnut