And that allows the production of specific types of proteins that eventually lead to forming the specific type of components and structures that are found within those specialized cells. So this is mechanism one of inductive signaling that allows cell determination to actually take place. Now, mechanism number two is direct contact. So in this case it was a ligand that was produced by one cell and moved to a second cell. In this case, those cells actually physically interact. So what happens is a protein on one cell interacts with the protein on the membrane of the other cell and when they bind by binding, that initiates the creation of some type of internal signal.