character: Cell Defender
topic: Immune Cells and Their Functions
grade: 6
subject: Science
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character: B Cells
topic: Types of Immune Cells and Their Roles
grade: 6
subject: Science
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character: T Cells
topic: How T Cells Identify and Attack Pathogens
grade: 6
subject: Science
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character: Macrophages
topic: The Role of Macrophages in Immune Response
grade: 6
subject: Science
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