It's harder to find, they're more limited numbers, and in general, more difficult until eventually down this pathway you have fully differentiated cells, cells that are fully mature and performing the function of the mature organ.

不过找起来更困难,因为它们数量稀少而且通常很难定位,在分化的终末阶段,你可以看到完全分化的细胞,这些细胞完全成熟,在成熟的器官中发挥功能

耶鲁公开课 - 生物医学工程探索课程节选