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肥大细胞生长因子P40是一种32000～39000糖蛋白。它能刺激体外辅助性T细胞生长,增强肥大细胞活性,并具有巨核母细胞白血病生长因子活性,被命名为IL-9。
Mast cell growth factor P40 is a 32000-39000 glycoprotein. It stimulates growth of helper T cells in vitro, enhances mast cell activity, and has megakaryocyte leukemia growth factor activity and is named IL-9.