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Kekkei Genkai (血継限界; Literally meaning "a technique limited to inheritance by blood" or "Bloodline Limit") are abilities passed down genetically in specific clans. Kekkei Genkai and their related jutsu can't be taught or copied by others, but it is possible to confer the ability to another person if it's localized in a particular organ like the eyes via organ transplant, like Obito passing his Sharingan eye to Kakashi. Kekkei Genkai abilities that work via the user's eye are called dojutsu. Kekkei Genkai is usually translated into Bloodline limit or Bloodlimit techniques.
It should be noted that there have been some techniques shown in the anime and manga that have not been explicitly labeled a kekkei genkai. It should be assumed that unless explicitly stated, these abilities are not kekkei genkai; rather, they are just specialized techniques that a person or clan developed and possibly, in the case of a clan, passes on. A good example is Naruto Uzumaki, who is a container of the demon fox (canon-wise); his rapid healing and secondary chakra supply, as well as the chakra's ability to alter his physiology to a certain degree, are a result of his access to the demon fox's chakra sealed within him. A requirement of a kekkei genkai, on the other hand, is that it is genetically passed on from parent to child within a specific group of individuals or clan. Although certain techniques may be exclusive to a clan because they are a well-kept secret, such as the Aburame clan's ability to control insects or Kidomaru's web abilities, they do not qualify as kekkei genkai because they could be learned by others outside the clan if information on the techniques was made available.
The following Kekkei Genkai may only be claimed when the character has resets (or in the case of dōjutsu, procured the eye(s) containing it) in it:
- First Official Data Book (秘伝・臨の書キャラクターオフィシャルデータBOOK, "Hiden: Rin no Sho Character Official Data Book")
- Second Official Data Book (秘伝・闘の書キャラクターオフィシャルデータBOOK, "Hiden: Tō no Sho Character Official Data Book")
- Jump's 2nd Great Hero Book's Mini Data Book (秘伝・翔の書オフィシャルキャラクターデータBOOK mini, "Hiden: Shō no Sho Official Character Data Book mini")
- Naruto manga chapters