character: T-helper Cells
topic: Role in Activating B-cells
grade: 9
subject: Biology
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character: B-cells
topic: How B-cells Respond to Antigens
grade: 9
subject: Biology
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character: Immune System
topic: Components of the Immune System
grade: 9
subject: Biology
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character: Antibodies
topic: Function and Production of Antibodies
grade: 9
subject: Biology
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