Immune System Timeline By Andowheat Feb 9, 2016 Antigen or foreign matter enters body. Feb 10, 2016 Node B cells are activated to produce an antibody mediated response Feb 11, 2016 T Cells begin to divide rapidly Feb 12, 2016 Antibody-mediated response Feb 13, 2016 Clone cells become plasma cells and memory B cells Feb 14, 2016 Antibodies combine with the specific antigen and inactivate or destroy it Feb 15, 2016 Suppressor T cells halt the immune response