i·so·an·ti·gen 
(ī′sō-ăntĭ-jən)
(ī′sō-ăntĭ-jən)n.
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·genic (-jĕnĭk) adj.
i′so·an′ti·ge·nici·ty (-jə-nĭsĭ-tē) n.
- Fort Nelson
- fortnight
- fortnightly
- for/to all intents and purposes
- Fortran
- fortress
- Fort Smith
- fortuitous
- fortuitously
- fortuitousness
- fortuity
- Fortuna
- fortunate
- fortunately
- fortunateness
- fortune
- fortune cookie
- fortune hunter
- fortuneteller
- fortunetelling
- Fort Wayne
- Fort Worth
- forty
- forty-five
- forty-niner