Now, what about cell determination? What exactly is the mechanism by which cell determination actually takes place? What is the mechanism by which that cell chooses that major to follow and then follows that major to produce that specialized type of cell? Well, in most cases cellular determination is due to a process known as inductive signaling that takes place between cells. Now, during inductive signaling one cell produces a special type of inductive signal, a molecule known as a ligand. And that ligand moves on to a second cell and it influences the second cell to basically choose that major to begin following a specific type of instruction set of instructions, that is cell differentiation to basically produce a special type of cell.