character: Rita
topic: Understanding Cell Communication
grade: 9
subject: Biology
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character: Dr. Cell
topic: Cell Signaling Mechanisms
grade: 9
subject: Biology
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character: Professor Bio
topic: The Importance of Cell Communication in Development
grade: 9
subject: Biology
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character: Cell Biologist Sam
topic: Types of Cell Communication: Autocrine, Paracrine, Endocrine
grade: 9
subject: Biology
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