character: Mr. Alex Chen
topic: Understanding Antibodies in Disease Prevention
grade: 9
subject: Biology
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character: Dr. Lisa Green
topic: The Role of Immune Cells in Fighting Infections
grade: 9
subject: Biology
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character: Ms. Sarah Kim
topic: Vaccines and Their Function in Immunity
grade: 9
subject: Biology
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character: Prof. John Smith
topic: How Antibodies Neutralize Pathogens
grade: 9
subject: Biology
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