undescended cell的用法和樣例：
例句
- Stem cells are unique cell populations with the ability to undergo both self-renewal and differentiation.
幹細胞是指同時具有自我更新和產生分化細胞的增殖性細胞。 - Transmission electron microscopy demonstrated that there were stem cell-like cells in cell spheres and neuron- and glia-like cells after the plating.
掃描電鏡可見細胞球和分化細胞的形態，透射電鏡可見細胞球和分化細胞的超微結構。
