character: White Blood Cells
topic: Role in Immune Response
grade: 9
subject: Science
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character: B Cells
topic: Antibody Production
grade: 9
subject: Science
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character: T Cells
topic: Cellular Immunity
grade: 9
subject: Science
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character: Macrophages
topic: Phagocytosis and Pathogen Defense
grade: 9
subject: Science
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