Omnipotent stemcells, illustration. Stem cells are undifferentiated cells that can produce other types of cell when they divide. This illustration shows umbilical stem cells, derived from an umbilical cord (top), being cultured in a petri dish (centre) and dividing into (from left to right): liver cells, blood cells (red blood cells shown), heart muscle cells (cardiomyocytes), neurons (nerve cells), and pancreatic cells (found in the islets of Langerhans).