hapten

hapten A foreign molecule that can bind to an antibody but does not evoke an immune response unless combined with a carrier protein. In hypersensitivity reactions haptens bound to endogenous proteins cause the body's immune system to attack both the hapten and the endogenous protein.

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"hapten." A Dictionary of Biology. 2004. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>.

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