1.Convoluted invaginations of the cell membrane form specialized structures called mesosome which function in the formation of cross-wall during cell division。

1.细胞膜卷曲，内陷可形成一种有结构，称介体。其细胞分裂有关。

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).

2.内吞过程涉及到细胞膜延伸和内陷。