Regenerative medicine includes the possibility of growing tissues and organs in the laboratory and implanting them when the body cannot heal itself. If a regenerated organ’s cells would be derived from the patient’s own tissue or cells, this would potentially solve the problem of the shortage of organs available for donation, and the problem of organ transplant rejection. Some of the biomedical approaches within the field of regenerative medicine may involve the use of stem cells. Examples include the injection of stem cells or progenitor cells obtained through directed differentiation such as cell therapies; the induction of regeneration by biologically active molecules administered alone or as a secretion by infused cells like immunomodulation therapy; and transplantation of in vitro grown organs and tissues such as tissue engineering.