undescended cell的用法和样例：
例句
- Stem cells are unique cell populations with the ability to undergo both self-renewal and differentiation.
干细胞是指同时具有自我更新和产生分化细胞的增殖性细胞。 - Transmission electron microscopy demonstrated that there were stem cell-like cells in cell spheres and neuron- and glia-like cells after the plating.
扫描电镜可见细胞球和分化细胞的形态，透射电镜可见细胞球和分化细胞的超微结构。
