STANFORD, Calif.--(BUSINESS WIRE)--Scientists at the Stanford University School of Medicine have identified a protein complex important in controlling whether embryonic stem cells retain their ability to become any cell in the body—a quality called pluripotency—or instead embark on a pathway of maturation and specialization. The finding is an important advance in the quest by scientists to harness the unique abilities of embryonic stem cells to treat disease and generate replacement tissue for the body.