character: Dr. Cell
topic: Cell Signaling
grade: 10
subject: Biology
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character: Cellular Communicator
topic: Intercellular Communication
grade: 10
subject: Biology
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character: Signal Sam
topic: Signal Transduction Pathways
grade: 10
subject: Biology
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character: Receptor Rachel
topic: Receptor Activation Mechanisms
grade: 10
subject: Biology
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