Definition: formation of indophenol blue by the action of an oxidizing enzyme present in certain cells and tissues when they are treated with a solution of a-naphthol and dimethylparaphenylenediamine; by this method, cells of the myelocyte series, which give a positive reaction, may be distinguished from those of the lymphocyte series, which give a negative reaction.
Synonym(s): Nadi reaction
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Examples: glitazone, GI cocktail, etc.