And upon the binding, each one of these dimerization arms basically stretches out and reaches out into a pocket found on the posing domain. So this arm stretches and binds here and this arm stretches and binds here. Because upon the binding of the EGF, there is a conformational change that takes place that allows these two intersurfaces to basically interact with one another. And this is the process we call dimerization. It produces a dimer. Whereas before we had these two individual separated monomers, now these two monomers basically come together to form a dimer structure.