Abstract
Summary
The distribution of monoamine oxidase activity in human tissues was surveyed. The significance of this distribution and the differences between humans and various animal species were discussed. Direct assay of MAO activity in specimens of jejunal mucosa obtained from human subjects by peroral biopsy was shown to be feasible. In a series of normal subjects studied in this fashion the range of variation is sufficiently narrow to make this a useful procedure for detection of spontaneous and induced variations of MAO activity.
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