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A protein or other substance, such as histocompatibility or red blood cell antigens, that is present in only some members of a species and therefore able to stimulate isoantibody production in other members of the same species who lack it. Also called alloantigen.

i′so·an′ti·gen′ic (-jĕn′ĭk) adj.
i′so·an′ti·ge·nic′i·ty (-jə-nĭs′ĭ-tē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Physiology) immunol an antigen that stimulates antibody production in different members of the same species
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌaɪ soʊˈæn tɪ dʒən, -ˌdʒɛn)

(formerly) an alloantigen.
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References in periodicals archive ?
Hanson, "Expression of A and B tissue isoantigens in benign and malignant lesions of the breast," Cancer, vol.
Effect of decalcification on the immunohistochemical expression of ABH blood group isoantigens. Appl Immunohistochem Mol Morphol.
Immunohistochemistry of the blood group ABH isoantigens and Oxford Ca antigen as prognostic markers for stage IB squamous cell carcinoma of the cervix.