character: Dr. Emily Johnson
topic: Understanding Pathogens and Immune Response
grade: 9
subject: Science
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character: Dr. Sarah Lee
topic: The Human Immune System: Defense Mechanisms
grade: 9
subject: Science
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character: Professor Mark Turner
topic: Bacteria vs. Viruses: Key Differences
grade: 9
subject: Science
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character: Dr. Alan Kim
topic: Vaccination and Its Role in Immunity
grade: 9
subject: Science
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