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. So they have extensive endoplasm reticulum that essentially forms many, many antibodies. And these antibodies that are formed by the plasma cell are specific and they complement the antigen that the B lymphocyte initially was bound to. And because we have many, many different types of plasma cells we have many different types of antibodies that are produced for each one of these different antigens that came from each one of these different types of pathogens.