Because remember, for the cell to actually grow and increase in size and ultimately divide, we have to basically grow proteins. We have to build proteins because the organelles and all the different components inside our cells are essentially formed from proteins. In fact, the entire cytoskeleton is formed from proteins. So we see in this final step activated ERCs move into the nucleus and stimulate transcription factors to increase gene expression. This increases the rate of protein production which enlarges the cytoskeleton and leads to cell growth and ultimately might lead to cell division to basically produce many more of these cells that were damaged as a result of, let's say, that particular cut that we experienced on our skin. So this is what we call the EGF signal transduction pathway.