character: Cell Membrane
topic: Cell Communication
grade: 9
subject: Biology
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character: Signal Molecules
topic: Cell Communication Mechanisms
grade: 9
subject: Biology
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character: Receptor Proteins
topic: Transport and Communication in Cells
grade: 9
subject: Biology
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character: Ion Channels
topic: Facilitated Transport in Cell Membranes
grade: 9
subject: Biology
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