Stock Photo: STEM CELL. STEM CELL Embryonic stem cell. Stem cells are undifferentiated cells which have retained their capacity to differentiate through division into a variety of other cell types. They are of interest to researchers for their therapeutic potential: cell replacement, transplants, etc. Embryonic stem cells are pluripotent, meaning they can potentially grow into over 200 different types of tissues. When adult stem cells are harvested directly from the patient to be treated, compatibility pr