Observations on the mono-amine oxidase activity of placenta and uterus

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Abstract
The presence of an active mono-amine oxidase in uterus was confirmed. Evidence was presented indicating that in the human uterus, and possibly also in the rat uterus, it was mainly localized in the endometrium. Human, rat, rabbit and guinea pig placentas were also found to be potent sources of the enzyme. The level of enzymic activity in rat placenta (expressed per g. of tissue) appeared to increase as the placenta matured in utero. The activity of the placental enzyme, like that of the enzyme in liver, was proportional to the oxygen tension of the medium in which it acted, a fall of oxygen tension causing a marked fall in rate of enzyme action.

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