Talk:Quinx/@comment-101.175.45.165-20150628164257/@comment-10733658-20150713003958

@Mmc2016, remember that Dr. Kanou mentioned being puzzled over the high rejection rates of his experiments. He was doing normal matching, but even then we only know of four confirmed cases of his experiments working out. According to that Kanou scene, there is likely something else besides normal organ donation matching involved.

After studying Kaneki, CCG seems to have figured out how to narrow down potential candidates. We're told there were six candidates out of all the students at the Junior academies in Tokyo. That suggests the compatibility ("Aptitude") is a very rare trait, and there are degrees of it since Saiko was considered unusually high.

Hence, my wondering if said factor for Aptitude is a genetic marker. That some humans are genetically closer-related to Ghouls than other humans and are therefore able to survive getting a kakuhou implant.

Using the canines comparison, it'd be like how some dog breeds are considered "primitive". They are more closely related to Wolves than other breeds. Or how some species of cats are more closely related than others, which can result in exotic crosses.