Cyclical variations in endometrial monoamine oxidase: Correlation of histochemical and quantitative biochemical assays

Abstract Parallel histochemical and biochemical microassay procedures have been used to confirm that a large increase in endometrial monoamine oxidase occurs in the late secretory phase of the human menstrual cycle. No such variation was observed during the rat oestrus cycle. The value of biochemical microassay procedures in supplementing information obtained by histochemical methods is pointed out.