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pros·ta·glan·din  (pr  s  t  -gl  n  d  n) KEY NOUN: - Any of a group of potent hormonelike substances that are produced in various mammalian tissues, are derived from arachidonic acid, and mediate a wide range of physiological functions, such as control of blood pressure, contraction of smooth muscle, and modulation of inflammation.
ETYMOLOGY: prosta(te) + gland1 + -in
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