Stem Cell
If you look for the definition for stem cell, you would most likely find that it states; Stem cells: n. ... The two major stem cells are adult stem cells and embryonic stem cells. An adult stem cell is an undifferentiated cell found among differentiated cells in a tissue organ. Embryonic stem cells are derived from embryos. The embryonic stem cells are not from fertilized eggs in a woman’s body. ... For the rest of the essay I will be discussing why stem cells are so important to us, why they are important for medical research, the reason why they are so controversial, and my thoughts or this important issue. Stem cells are important to us because they can be made up of some adult tissues like bone marrow, muscle, and brain.