So the B lymphocytes contains the B cell receptors and when the B lymphocyte approaches our macrophage, if the B cell receptor complements this antigen we can have the binding process take place. They will form a complex and that will ultimately call upon a cell involved in the cell mediated immunity known as the helper T cell. And what the helper T cell does is it releases a special type of chemical or special types of chemicals which basically help the B lymphocyte undergo mitosis and differentiate into two different types of cells. So the B lymphocytes form plasma cells and memory B cells. And the memory B cells are the same cells that we spoke about earlier that are involved in the process of learning. So plasma cells are those specialized cells that are factories for antibodies.