Yep, but who's DNA would be used once it was part of the receiver's system? It would probably take longer to heal than it would take for any retained cells to mature, but say a year after the operation? Is it already programmed with the donator's DNA, or would it just become part of the reciever's system and start using his DNA? I don't know how this conversation came up, but I'm sure a good amount of booze and such was involved.