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，可形成一种特有的结构，称中介体。其功能与细胞分裂有关。

The process involves extension and invagination of the plasma membrane to form small vesicles in pinocytosis (pinocytotic vesicles) or vacuoles in phagocytosis (food vacuoles).

吞过程涉及到细胞膜的延和。