| Cytokine Therapy. Cytokines are proteins that are produced naturally in our bodies. In general, cytokines help our immune system operate more effectively. One of the most studied cytokines, for example, is interleukin-2 (IL-2). IL-2 helps stimulate the immune system by increasing the number of lymphocytes and activating them to make them more effective. Groups worldwide are investigating the use of different cytokines as cancer therapies. Cytokines are also being studied as agents to assist vaccines in being recognized by the immune system (vaccine adjuvants).
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