character: B Cell Activation
topic: How B Cells Respond to Pathogens
grade: 9
subject: Science
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character: Immune Response
topic: Introduction to the Immune System
grade: 9
subject: Science
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character: Pathogens
topic: Types of Pathogens and their Effects
grade: 9
subject: Science
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character: Antibodies
topic: Role of Antibodies in Immune Defense
grade: 9
subject: Science
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