character: Memory T-cells
topic: Immunological Memory and Response to Pathogens
grade: 9
subject: Biology
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character: T-Cell Activation
topic: Role in Immune Response
grade: 9
subject: Biology
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character: B-Cells
topic: Collaboration with T-Cells in Immunity
grade: 9
subject: Biology
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character: Pathogen Recognition
topic: How the Immune System Identifies Invaders
grade: 9
subject: Biology
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