Later systems had radially mounted shoes to provide more stable contact through lever action. 后面的系统放射状设置集电靴通过杠杆作用来提供稳定接触。
Dendritic protrusions stabilized after making contact with astrocytes, such that protrusion lifetimes were longer if contact occurred. 树突状突起与星形胶质细胞相互作用以后更加稳定,因此这种接触发生后突起寿命会延长。