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"I have used a wide variety of secondaries and Jackson ImmunoResearch has consistently been the best. The fluorophores are bright and stable and their selective (x reactivity removed) secondaries have always shown species specificity in multiple labeling."
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PAP soluble immune complexes are prepared by the method of Sternberger et al. (J Histochem. Cytochem. 1970. 12, 315). Theoretically, they consist predominantly of two anti-HRP antibodies in soluble complex with three molecules of HRP.
PAP soluble complexes are normally used at 25-50 μg/ml. Whole antisera against IgG (H+L) are recommended for bridging PAP to primary antibodies. Antisera against IgG (H+L) or against the F(ab')2 fragments of IgG will also bridge PAP to IgM primary antibodies (such as IgM monoclonal antibodies) by virtue of common light-chain recognition. Normal serum (5% v/v) from the same host species as the bridging antibody is suggested as a blocking solution to minimize non-specific binding. All PAP soluble complexes are freeze-dried at 20 mg/ml.