Embryonic stem cells (ESC) are undifferentiated totipotent cells that could be differentiated in vivo into any kind of c摘要胚胎干细胞是一种具有发育全能性的细胞系，理论上能分化为包括生殖细胞在内的各种组织细胞。
Totipotent - having unlimited capability. Totipotent cells have the capacity to specialize into extraembryonic membranes全能—具有无限能力。全能细胞具有分化为特定的胚胎外膜和组织、胚胎以及所有胚胎后组织和器官的能力。