So here we have the B lymphocyte that essentially contains the antigen bound to the MHC class two complex. So if we have a nearby helper T cell that contains not only the complementary T cell receptor and this CD four, but also this CD four glycoprotein, only then can this binding process takes place. And once this binding process takes place between the B lymphocyte and our helper T cell, now we begin to initiate different types of defensive responses. What happens is the helper T cell begins to release lymphocines or lymphocons. And what these chemicals do is they basically initiate the process of cloning. So this B cell begins to clone itself and when it clones itself, it produces identical cells, identical B cells that contain the same exact B cell receptor.