character: BioBuddy
topic: Types of Cells in the Immune System
grade: 6
subject: Science
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character: Immune System Hero
topic: White Blood Cells and Their Functions
grade: 6
subject: Science
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character: Cell Explorer
topic: Overview of the Immune System
grade: 6
subject: Science
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character: The Antibody Advocate
topic: Role of Antibodies in Immune Defense
grade: 6
subject: Science
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