Stem cell is undifferentiated cell of multicellular organism which is capable of giving rise to indefinitely more cells (through mitosis) of same type and from which certain other kinds of cell may be formed by the cellular differentiation. There are two types of stem cells widely used
- Embryonic stem cells:
- They come from human embryos that are three to five days old.
- They are harvested during process called in-vitro fertilization.
- They are known as pluripotent stem cells.
- These cells can give rise to virtually any other type of cell in the body.
- Induced pluripotent stem cells (iPSCs):
- They can differentiate into all types of specialized cells in body.
- They can potentially produce new cells for any organ or tissue.