Different kinds of proteins are present in different cells (Recce, 2005). Studies suggest that the effectiveness of signal transduction may be improved by the existence ofÂ scaffolding proteins, large relay proteins to which numerous other relay proteins are concurrently attached (Recce, 2005). Scaffolding proteins have also been found in the brain cells that permanently hold together networks of signaling-pathway proteins at synapses, resulting in a better speed and accuracy of signal transfer between cells (Recce, 2005). In the multi-cellular organism, each molecular change in signaling pathways must last only for a short period of time for a cell to stay alert (Recce, 2005). The reversibility of the changes that signals produce is essential for continuing receptiveness of a cell (Recce, 2005). Thus, when signal molecules leave the receptor, the receptor reverts to its inactive form, then, by a variety of means, the relay molecules return to their inactive forms and so forth. As a result, the cell is soon ready to respond to a fresh signal.
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