Identification of Blood Monocytes by Demonstration of Lysozyme and Peroxidase Activity

Abstract
By a simple cytochemical method for the de- monstration of lysozyme (muramidase) activity, more than 95 % of human- and rat-blood monocytes could be identified and differentiated from lymphocytes. Peroxidase activity was seen in 83–88 % of the monocytes. When a staining method for lysozyme and peroxidase activity in the same cell was used, most blood mononuclear cells showed neither or both kinds of enzyme activity. Of the rat mononuclear cells, 6.9 % showed peroxidase activity alone

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