Macrophages 'process and present" bacterial antigen to B-and T-cell clones specific to the antigen Macrophage Helper T cell Antibodies enhance phagocytosis by coating the bacteria Cell division Activated Helper T cells secrete B-cell helper T cell growth factor that enhances B-cell proliferation and antibody secretion B-cell growth factor Plasma cell Plasma cells secrete antibodies that bind with the antigenic bactera Antibodies