B cell activation diagram. Process of recognizing an antigen and binds to it. Bidirectional activation signals. Allergic diseases concept. Human immune system medical flat vector illustration. premium vector by Pikovit

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white background illustration design isolated human health blood medical care memory icon structure cell flat disease biology science system virus membrane poster immunity scheme binding reaction anatomy diagram plasma allergic allergy infection activation response inflammation leukocyte allergen immune receptor Antibody immunology antigen leukemia lymphocyte infographic apoptosis lymphoblast cytokines

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