The signal is maintained even when the Calcium ions are exhausted , as calcium channels present on the cell membrane are opened and the extra-cellular calcium flows in . The Calcium ion binding protein Calmodulin is also activated that controls the activity of other enzymes present in the cell . The signal is transmitted to the nucleus . DAG on the other hand activates the enzyme Protein kinase C . They may act in several mechanisms to finally ensure that the signal has reached the...











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