1. Convoluted invaginations of the cell membrane form specialized structures called mesosome which function in the formation of cross-wall during cell division。
   细胞膜卷曲，内陷可形成一种特有的结构，称中介体。其功能与细胞分裂有关。
2. The process involves extension and invagination of the plasma membrane to form small vesicles in pinocytosis (pinocytotic vesicles) or vacuoles in phagocytosis (food vacuoles).
   内吞过程涉及到细胞膜的延伸和内陷。

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