And then what that signal does is it alters the gene expression of that cell and that ultimately determines what type of pathway that cell will follow and what type of cell it will actually produce. And finally, we have gap junctions. So some cells are actually physically connected to one another via special type of junction known as a gap junction. And so in this case, what happens, one of the cells produces some type of signal. That signal moves along this gap junction and into the second cell and it influences the nearby cell to determine its pathway. And eventually that will lead to a specific type of set of pathways.