character: Dr. John Smith
topic: Cell Communication Mechanisms
grade: 12
subject: Biology
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character: Dr. Emily Johnson
topic: Signal Transduction Pathways
grade: 12
subject: Biology
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character: Dr. Sarah Lee
topic: Endocrine System and Hormonal Communication
grade: 12
subject: Biology
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character: Dr. Michael Brown
topic: Neuronal Signaling and Synaptic Transmission
grade: 12
subject: Biology
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