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Protein diazotization followed by alkaline coupling with a naphthol has been successfully applied for the histochemical localization of the protein bound tyrosine in tissues. Prolonged nitrous acid treatment in the cold is required (18-24 hours at 3°C). The best coupling reagent so far tried is 1-amimio-8-naphthol-4-sulfonic acid (S acid) and coupling succeeds best in a 1 % potassium hydroxide in 70 % alcohol, allowing 1 to 4 hours at 3°C. Topochemical results parallel those of the Millon reactions, with greater color intensities and superior histologic definition.

ADAPTATION OF THE MOREL SISLEY PROTEIN DIAZOTIZATION PROCEDURE TO THE HISTOCHEMICAL DEMONSTRATION OF PROTEIN BOUND TYROSINE