character: Mr. David Brown
topic: The Role of Leukocytes in the Immune System
grade: 11
subject: Science
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character: Dr. Emily Carter
topic: Types of White Blood Cells and Their Functions
grade: 11
subject: Science
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character: Ms. Sarah Johnson
topic: How the Immune System Responds to Infection
grade: 11
subject: Science
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character: Mr. John Smith
topic: The Importance of the Immune System in Human Health
grade: 11
subject: Science
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