Lymphokines/Cytokines:             a. interleukin I - costimulator for activated T-cells             b. interleukin II - stimulates both B and T-cell      proliferation             c. MAF - macrophage activating factor             d. MIF - macrophage migration inhibiting factor             e. perforin - causes cell lysis             f. lymphotoxin - kills cells by fragmenting their DNA             g. tumor necrosis factor - specialized destruction of      tumors.