First, the RER became the diflferent size vesicles, then, the ribosomes on the little vesicles began to fall, and finally, the RER turned to the concentric round lamellar structures.

• 粗面内质网的结构先是裂解为微粒体，然后微粒体上的核糖体开始脱落，直至成为同心性板层小体。