| http://www.w3.org/ns/prov#value | - In response to tumor antigens, a subset of lymphocytes, helper T cells, secrete a small amount of IL-2, which actslocally at the site of tumor antigen stimulation to activate cytotoxic T cells and natural killer cells that mediate systemic tumor cell destruction.In addition to immunostimulatory agents such as cytokines, which positively regulate immune effector functions, there also exist molecule
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