Any of a class of physiologically active substances present in many tissues, with effects such as vasodilation, vasoconstriction, stimulation of the smooth muscles of the bronchus or intestine, uterine stimulation; also involved in pain, inflammation, fever, allergic diarrhea, and dysmenorrhea. A potent hormone – similar in structure to an unsaturated fatty acid – that acts in extremely low concentrations on local target organs; first isolated from the prostate.
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