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Meaning of precipitinogen

pre•cip•i•tin•o•gen

Pronunciation: (pri-sip"i-tin'u-jun, -jen"), [key]
— n.
  1. an antigen that stimulates precipitin production or that reacts with antibody in an immunoprecipitation reaction.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.