What are fetal stem cells?
The developing organs and tissues in a fetus contain a relatively large supply of stem cells because they are needed for growth and maturation. The difference between embryonic stem cells and fetal stem cells is the fetal stem cells have matured part of the way to mature cells. For example, if it takes 20 maturation steps for an embryonic stem cell to turn into a mature skin cell, fetal skin cells are at step 10; they are not as mature as adult skin stem cells, but they are past the stage of becoming committed to the liver.