The axon then continues to grow, towed by an amoeboid structure at its tip. 轴突前端有变形虫般的构造，会牵引轴突往前生长。
A multinucleate mass of cytoplasm formed by the aggregation of a number of amoeboid cells,as that characteristic of the vegetative phase of the slime molds. 原质团由大量变形虫细胞聚集形成的细胞质的多核团，与粘菌的无性繁殖阶段的特性类似。
