character: T cells
topic: Cell-Mediated Immunity
grade: 9
subject: Biology
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character: Helper T cells
topic: Role in Immune Response
grade: 9
subject: Biology
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character: Cytotoxic T cells
topic: Killing Infected Cells
grade: 9
subject: Biology
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character: Memory T cells
topic: Long-Term Immunity
grade: 9
subject: Biology
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