为了理解细菌如何影响免疫系统，研究人员在液体中培养路氏乳杆菌，然后将无细菌的少量液体转移到从小白鼠分离出的未成熟免疫细胞中。
To understand how the bacteria affected the immune system, the researchers grew L. reuteri in liquid and then transferred small amounts of the liquid - without bacteria - to immature immune cells isolated from mice.