character: Professor Mark Johnson
topic: The Role of White Blood Cells
grade: 11
subject: Science
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character: Dr. Lisa Chang
topic: Immune System Overview
grade: 11
subject: Science
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character: Mr. Andrew Smith
topic: Functions of Different White Blood Cells
grade: 11
subject: Science
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character: Dr. Sarah Taylor
topic: How White Blood Cells Combat Infection
grade: 11
subject: Science
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