... on the perimeter of all cells, and differs between each person (NMDP). Although this system of cellular identification is usually beneficial because it protects the body, it served as a major hindrance for bone marrow transplantation, because donor cells must be the perfect match or else they will be rejected by the host's immune system. In 1968, the first successful stem cell ... ...

• Word Count: 2913
• Approx Pages: 12
• Grade Level: Undergraduate