And by contracting, what those cells do is they create mechanical forces, these physical forces that can act on nearby cells. And by exerting some type of mechanical force on a nearby cell, what that can do is it can basically stimulate the process of not only morphogenesis, but also cell determination, cell differentiation, as well as cell growth and cell proliferation. So we see that morphogens can also stimulate the expression of contractile proteins such as actin and myosin. Now, the contraction of these proteins can change the shape and size of the cell and this can exert a force on nearby cells and that can ultimately influence things like gene expression, cell determination, cell differentiation and morphogenesis. So we see that morphogenesis is stimulated by not only these chemical factors, but also these mechanical factors. And more specifically, when these morphogens influence the processes inside the cell.