Board Thread:Theories and Speculation/@comment-995176-20141108204910/@comment-1292715-20141110163951

@Tori225 Mind you, the whole combining Senju DNA and Uchiha DNA making the Rinnegan is not entirely true. It was more the merging of the chakra of the reincarnations of Asura and Indra.

But even so. You may be on to something about the whole mutation business.