character: B-cells
topic: Interaction between Helper T-cells and B-cells
grade: 9
subject: Biology
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character: Helper T-cells
topic: Role in activating B-cells
grade: 9
subject: Biology
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character: Antibodies
topic: Produced by B-cells upon activation
grade: 9
subject: Biology
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character: Immune Response
topic: Collaboration of T-cells and B-cells
grade: 9
subject: Biology
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