Feel free to nitpick anything and everything I'm saying in the topic.
When someone receives an organ, they have to take drugs so that organ is not rejected. Over time, many years for example, does the chance of rejection drop? I would assume it does, because cell tissue in our bodies gets replaced over time. So an organ that started out as 100% foreign DNA would over time become 'assimilated'. I'm assuming some tissues are permanent and don't get replaced? What about something like Skin? there are face transplants now and skin is definitely a type of tissue that is regenerated constantly. So can these types of transplants become 'permanent', so that no drugs are needed to stop rejection?
Also, semi-serious question about testicles. If a testicle was transplanted, I'm assuming it would produce the donor's sperm, because they are made within the testicle and based on DNA inside the testicle?