Stem cells can be expanded in large numbers and retain their ability to differentiate into mature functional cells.

干细胞具有自我复制的能力，在一定条件下，它可以分化成各种功能细胞。

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That difference has functional consequences for the daughter cells in that one of the daughter cells becomes what's called here a committed progenitor cell.

而这些差异会导致子细胞,产生一些功能上的变化,其中一个子细胞会成为,所谓的定向祖细胞

耶鲁公开课 - 生物医学工程探索课程节选

The research has been promising so far, and has increased the number of functional liver cells the team has been able to maintain in artificial tissues.

ENGADGET: Researchers use 3D printer, sugar, to create a fake artery network for lab-grown tissue

It has already been shown that small pellets of the right type of cells transplanted into the jaw can develop into functional teeth.

BBC: Researchers grow teeth from gum cells