Methods: AGP was added to single nuclear cells from human umbilical cord blood and the activity of granulo-macrophage colony-stimulating factor ( GM-CSF) in long-term culture system was observed. 方法:选用脐带血单个核细胞,加入适量红毛五加多糖,观察长期液体培养系统中粒、单系祖细胞集落刺激因子(GM-CSF)的活性。