So in diffusion, what happens is one cell that is next to another cell begins to produce a special type of ligand molecule and that molecule diffuses across the cell membrane into the extracellular matrix and eventually this ligand moves on to a nearby cell. It attaches onto a special protein receptor found on the membrane and by attaching it creates some type of secondary mechanism response. And so let's say some type of part of that protein on the other side basically detaches and then creates a secondary metric system that eventually influences the transcription and the translational process of that cell. 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.