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This file is about signal Transduction animation using flash media or swf format. Signal transduction occurs when an extracellular signalling molecule activates a cell surface receptor. In turn, this receptor alters intracellular molecules creating a response. There are two stages in this process:
1. A signalling molecule activates a specific receptor on the cell membrane.
2. A second messenger transmits the signal into the cell, elicting a physiological response.
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