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When a user of the Mangekyō Sharingan wants the Eternal Mangekyō Sharingan, do they have to take the eyes of their sibling, or could they obtain the EMS by taking the Sharingan eyes of any Uchiha?

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While researching, I found this:

Their vision can be restored by receiving the transplanted Mangekyō of an Uchiha with strong blood ties — ideally a sibling — thus awakening so-called Eternal Mangekyō Sharingan.

So my question is: what is considered "strong blood ties"? Father, aunt, 2nd cousin twice removed?

Is there any other source that explains this in greater detail?

  • Well, since it says "strong blood ties" I guess they do have to be closely related or else it won't work? – Akira Mahisaseru Oct 20 '16 at 19:52
  • @Ms.Steel Yeah, so I'm asking what exactly does that mean? Let's say that Itachi had access to his father's eyes. If he transplanted those, would he obtain the EMS? I would consider a father to be a "strong blood tie", but they never mention anything like that in the show. All they mention is taking the eyes of their siblings. – Hunter Turner Oct 20 '16 at 20:10
  • Itachi will only activate the EMS if his father already had the MS, if he didn't then... to bad for him I guess. – Akira Mahisaseru Oct 20 '16 at 20:37
  • @Ms.Steel, that's not true. Itachi was "attempting" to take Sasuke's eyes to obtain the EMS, and Sasuke did not have the Mangekyō Sharingan. – Hunter Turner Oct 20 '16 at 20:38
  • Then I have no idea, that was just my theory... – Akira Mahisaseru Oct 21 '16 at 1:19
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The answer to this question is that there is not enough evidence to answer this question correctly without any speculation.

Throughout the series, Uchiha Madara and Uchiha Sasuke are the only ones to obtain Eternal Mangekyou Sharingan. Both obtained it by transplanting their brothers' eyes and both of their brothers have obtained Mangekyou Sharingan before the transplatation happened. Thus, we can't say for sure whether transplanting other close relatives eyes would work or not.

Genetically speaking, a child is genetically 50% of his mother and 50% of his father. Him and his sibling can be more similar in case of a identical twin. But most of the time, they would be genetically more distant. A child would most likely have a different sets of chromosome compared to his sibling. Because of this, the genetic similarity between siblings vary.

If we are to take Madara and Sasuke's case as the base for our hypothesis, then transplantation between a child and his parents should work. Transplanting from grandparents should also work since they are 25% genetically similar. Transplanting from Aunt or Uncle might work, depending on how similar they are to the recipient genetically. The further away they are genetically, the less chance for it to work. That is if we take that Eternal Mangekyou Sharingan requires Mangekyou Sharingan from a close relative.

  • One question I do have. When Itachi "gave" Sasuke the Mangekyō Sharingan, did he lose it himself? If so, then saying "both of their brothers has obtained Mangekyou Sharingan before the transplatation happened" would not be true, because it would have been already transferred to Sasuke and Itachi would not have the MS. It's hard to say if this happened or not, because he died right after. – Hunter Turner Oct 21 '16 at 14:20
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    Sasuke's eye transplantation happened after his fight against Danzo, which is quite some time after Itachi's death. Transplantation means he takes Itachi's eyes and put it into his own eye socket. This is more evident in Madara's case where his brother was shown dead with cloth covering his eyes, suggesting that his eyes was taken. – 絢瀬絵里 Oct 21 '16 at 15:06
  • I felt as if this question was turning into a different one (partly my fault), so I created this new question talking about if a normal Sharingan can be used for EMS. – Hunter Turner Oct 21 '16 at 15:10

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