Improved double immunoenzyme labelling using alkaline phosphatase and horseradish peroxidase

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Abstract
Alkaline phosphatase and peroxidase complexes were applied to tissue sections simultaneously to label two antigens. An azo-coupling method was used to demonstrate the alkaline phosphatase activity. The final result gave clear contrast between the two antigens and allowed the use of haematoxylin as the nuclear counterstain.