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，
形成一种特有的结构，称
介体。其功能与细胞分裂有
。
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In a very similar way, the membranes covering your lungs for example, are actually invaginations of your epithelium — where the tissue that makes up your you-tube folds to form a cavity — just like this balloon when I push my fingers into it.
个比方，覆盖在你肺部
薄膜实际上是上皮内陷——构成你输卵管组织折叠形成一个
——
我把手指伸进去这个气球。
