character: Cellular Sally
topic: The Immune System's Defense Mechanisms
grade: 9
subject: Science
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character: Patrol Pete
topic: White Blood Cells and Their Role in Immunity
grade: 9
subject: Science
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character: Antibody Annie
topic: How Antibodies Recognize Pathogens
grade: 9
subject: Science
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character: Vaccine Victor
topic: The Role of Vaccines in Strengthening Immunity
grade: 9
subject: Science
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