character: Immune System
topic: Immune Response to Viral Infections
grade: 9
subject: Biology
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character: Virus
topic: Mechanisms of Viral Entry
grade: 9
subject: Biology
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character: White Blood Cells
topic: Role of White Blood Cells in Defending Against Viruses
grade: 9
subject: Biology
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character: Antibodies
topic: How Antibodies Neutralize Viral Infections
grade: 9
subject: Biology
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