Well, the best case scenario the best way to actually ensure that the organ or tissue that is transplant that is successfully accepted by that host individual is to actually use the same tissue of that individual. Now of course this cannot be done always. We can, for example, easily transplant a piece of skin from one location to a different locations in our body. But obviously we can't transplant things like the heart because we only have a single heart. Another good case scenario is if we have a twin. If we actually have an identical twin this creates very little complications because those two twins will have very similar, if not identical MHC major histor compatibility cells, antigen complexes.