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interferon

noun [C or U]
 
 
/ˌɪn.təˈfɪə.rɒn/ US  /-t̬ɚˈfɪr.ɑːn/ specialized

Definition

one of several proteins in the body that are produced by cells as a reaction to infection by a virusImmunology and vaccination
(Definition of interferon noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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