Methods: First, Cells from normal adult peripheral blood were cultivated by different concentration of IL-15, MTT methods were used to measure the proliferation of PBMC.

• 方法：采集并分离健康成人外周血单个核细胞（PBMC），分别加入不同浓度的IL-15，MTT法检测PBMC增殖程度的变化，选择最适的IL-15浓度；