Tissue engineering has recently been applied to the construction of natural oesophagi in rats. The oesophagus is the gastrointestinal system between the mouth and the stomach. Researches in Sweden have developed this method in which bone marrow cells are safely and effectively transplanted in rats. Researchers found that the transplanted organs remain patent and show regeneration of nerves, muscles, cells and blood vessels. This finding could prove to be life saving in the future. Researchers also found that with chemically engineered organs have stronger immune systems and require less immunosuppressive drugs. I believe this finding will soon apply to humans and be a great help to society.