Cloned plasma cells produce antibodies that fit the antigens on the surface of the pathogen, bind to the antigens and disable them or act as opsonins or agglutinins. (primary immune response)Some cloned B cells develop into B memory cells. If the body is infected by the same pathogen again, the B memory cells divide into plasma cell clones. These produce the right antibody and wipe out the pathogen quickly. (secondary immune response)