Undifferentiated cells called stem cells can differentiate into different types of cells as the body requires them. As stem cells explain various bodily functions and how they can occasionally go awry, scientists and medical professionals are interested in them. The last ten years have seen a remarkable evolution in stem cell therapy. In stem cell transplants, stem cells either restore diseased or chemo-damaged cells or help the donor's immune system fight certain cancers and blood-related illnesses.