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已经证明哺乳动物周围血液中有各种类型细胞被分离出来,对其表面特性及其在免疫反应中的功能已有所了解。但只有用适当的方法大量分离提纯到某型细胞之后,才
It has been demonstrated that various types of cells in the bloodstream around mammals are isolated and their surface properties and their function in the immune response are well understood. However, only a large number of isolated and purified to a certain type of cells by the appropriate method