Ten-year-old undergoes surgery which could herald revolution in transplant techniquesA 10-year-old boy has undergone an operation to replace his windpipe using his own stem cells, which could herald a revolution in transplant surgery.The boy, who is convalescing at Great Ormond Street children's hospital, in London, has not been identified.He was born with a windpipe that was 1mm across - too narrow for him to be able to breathe unaided.The boy was given a denuded donated windpipe which was coated just a few hours before the operation with his own stem cells, chemically "programmed" to turn into the appropriate tissues while inside his body.Professor Martin Birchall, the head of translational regenerative medicine at University College London, said: "It is the first time a child has received stem cell organ treatment, and it's the longest airway that has ever been replaced."We need to conduct more clinical trials to demonstrate that this concept works. We'd like to move to other organs as well, particularly t