That's how tight the junctions are, not even a small molecule like glucose can pass between them.

可见胞间连接多么紧密,甚至像葡萄糖这样小的分子也不能通过

耶鲁公开课 - 生物医学工程探索课程节选

A small molecule gets produced by cells in one part of the body, circulates in the blood, estrogen enters cells, and sometimes that estrogen is able to penetrate deep within the cell, even into the nucleus.

雌激素是由身体某部分细胞分泌的,随着血液循环进入细胞,有时雌激素能够进入到细胞内部,甚至进入到细胞核内

耶鲁公开课 - 生物医学工程探索课程节选

One of the enzymes that often gets activated is an enzyme which converts ATP, a small molecule that is inside all of our cells.

在经常被激活的酶中有一种酶,其功能是转化ATP,ATP是一种,存在于所有细胞中的小分子物质

耶鲁公开课 - 生物医学工程探索课程节选