Embryonic stem cells

Embryonic stem cells: These cells are derived from embryos that are three to five days old. At this stage of development, an embryo is referred to as a blastocyst, and contains about 150 cells total. These cells are pluripotent, which means that they can split into more stem cells and can also develop into any type of tissue found in the body. Because these cells are so versatile, they are useful for regenerating or fixing tissue or organs that have become diseased. However, their use in humans is currently limited to aiding those with eye disorders such as macular degeneration.