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hap·ten(hăp′tĕn′) also hap·tene (-tēn′)
A small molecule that reacts with a specific antibody but does not induce an immune response unless bound to a larger molecule, usually a protein.
[German : Greek haptein, to fasten + German -en, noun suffix (from Greek -ēnē, -ene).]
(Physiology) immunol relating to a hapten