Board Thread:Theories and Speculation/@comment-5413572-20150114180437/@comment-24593592-20150220162753

Well it's stated that not every Uchiha had awakened the Sharingan.

Elveonora wrote: For other kekkei genkai evolving, not sure about that, since the databook says that the known kekkei genkai are fragments of Kaguya's power and Orochimaru and Kabuto's quest to retrace back to Hagoromo's power by taking people's cells support that. If the current chakra/genes were evolved, retracing wouldn't be possible since the result would be different.

Where in the databook does it state this?