Avidin-biotin-immunoglucose oxidase: use in single and double labeling procedures.

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Abstract
We have investigated the use of an avidin-biotin-immunoglucose oxidase (AB-GO) technique for single and double antigen localization in conjunction with the avidin-biotin-immunoperoxidase (AB-P) technique in fixed, embedded specimens, using sequential monoclonal and polyclonal antibodies of the same species. The optimal technique for double labeling requires the first antibody to be applied and localized with the AB-P technique using 3,3'-diaminobenzidine (DAB) as the chromogen, followed by an optional elution step and/or incubation with mild detergent (0.01% Triton). The second antigen is localized with the AB-GO technique with nitro blue tetrazolium (NBT) as a chromogen. Effects of antigen concentration, intermediate elution steps, and the relative efficiency of the two methodologies are described.

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