character: Immunoglobulin G (IgG)
topic: Secondary Immune Response
grade: 9
subject: Science
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character: B Cells
topic: Role in Immune Response
grade: 9
subject: Science
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character: Antigens
topic: Activation of Immune System
grade: 9
subject: Science
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character: Memory Cells
topic: Long-term Immunity
grade: 9
subject: Science
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