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   Histamine antagonist
   A histamine antagonist (commonly called an antihistamine) is a pharmaceutical drug that inhibits the action of histamine by blocking it from attaching to histamine receptors; or it may inhibit the enzymatic activity of histidine decarboxylase, catalyzing the transformation of histidine into histami...
   Found op http://en.wikipedia.org/wiki/Histamine_antagonist
   
   

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