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• Antagonist - Wikipedia, the free encyclopedia

  An antagonist (from Greek ανταγωνιστής - antagonistes, "opponent, competitor, rival") is a character or group of characters, or, sometimes an institution of a happening ...

• Receptor antagonist - Wikipedia, the free encyclopedia

  A receptor antagonist is a type of receptor ligand or drug that does not provoke a biological response itself upon binding to a receptor, but blocks or dampens agonist-mediated ...

• antagonist - Definitions from Dictionary.com

  noun . 1. a person who is opposed to, struggles against, or competes with another; opponent; adversary.

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