character: Macrophage
topic: Macrophages and Their Role in the Immune Response
grade: 9
subject: Biology
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character: White Blood Cell
topic: Types of White Blood Cells in Immune Defense
grade: 9
subject: Biology
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character: Antibody
topic: Role of Antibodies in the Immune System
grade: 9
subject: Biology
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character: Pathogen
topic: How Pathogens Trigger Immune Responses
grade: 9
subject: Biology
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