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Endogenous mannary gland peroxidase in acinar cells of prelactating and lactating rats is revealed in tannic acid-formaldehyde-glutaraldehyde-fixed tissue by means of the standard diaminobenzidine procedure. Diaminobenzidine cytochemical reaction product is present in perinuclear cisternae, in the granular endoplasmic reticulum and in Golgi apparatus of functionally differentiated secretory cells. The mammary gland peroxidase is thought to represent lactoperoxidase. Peroxidase staining is diminished or absent in acinar cells of hypophysectomized and ovariectomized rats, in normal rats during early pregnancy and in nonpregnant mature females. Endogenous peroxidase or a heme protein with peroxidatic activity may be considered an ultracytochemical marker enzyme for acinar cells actively engaged in lactogenesis.

journal of histochemistry and cytochemistry/the journal of histochemistry and cytochemistry

Ultrastructural localization of endogenous mammary gland peroxidase during lactogenesis in the rat results after tannic acid-formaldehyde-glutaraldehyde fixation.