It can influence the shape and the size of that cell. For example, special types of cells can produce special types of proteins known as myosin and actin. And when myosin and actin, which are found in muscle cells, contract, they cause those cells to actually contract. 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.