character: T Cell
topic: Defense Mechanisms, Responses of the Immune System to Infection
grade: 9
subject: Science
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character: B Cell
topic: Humoral Immunity and Antibody Production
grade: 9
subject: Science
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character: Macrophage
topic: Phagocytosis and Immune Response
grade: 9
subject: Science
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character: Antigen
topic: Role of Antigens in Immune Response
grade: 9
subject: Science
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