Cellular Cooperation antigen Plasma Cells Antigen presentation to T and B cells by APC T cells elaborate cytokines to Antibody secretion by Antigen presenting cell facilitate B cell proliferation plasma cells and maturation Cellular Cooperation TH B antigen Antibody secretion by plasma cells Plasma Cells Antigen presenting cell Antigen presentation to T and B cells by APC T cells elaborate cytokines to facilitate B cell proliferation and maturation