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antigen

noun [C]
 
 
/ˈæn.tɪ.dʒən/ /-dʒen/ US  /-t̬i-/ specialized

Definition

a substance that causes the production of antibodies in the bodyImmunology and vaccinationThe circulatory system and blood
(Definition of antigen noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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