An o-dianisidine method of horseradish peroxidase neurohistochemistry.

Abstract
A new method of horseradish peroxidase neurohistochemistry using o-dianisidine (OD) as the chromogen was described. In labeling neurons of the hypoglossal nucleus in rats and cats, the new OD method was as sensitive as Mesulam''s method using tetramethyl benzidine as the chromogen.