| Precursor | Embryonic | |
| Stability | Somewhat stable | unstable due to oncogenicity |
| Treatment used | > 70 years and about 1 million patients treated with sufficient data | < 70 years |
| Attainability | Easy and safe, from a fetus in natural environment | Exist only in a laboratory dish and not in a living embryo |
| Origin | Animal-abundantly available | Human-rare |
| Renewal | Long term self renewal | Self renewal except in cancer cases |
| Method of Preparation | Based on primary tissue culture of tissue fragments or cell clusters. | Based on primary cell culture of dispersed cells |
Our Precursor Stem Cells
Versus Embryonic Stem Cells