Board Thread:Fourth Databook/@comment-4271790-20141104211032/@comment-945885-20141105054816

The section about the various fragments Kaguya left behind, which points out the Byakugan and the Kaguya clan's ability to turn their bones into a weapon, doesn't really give any clear explanation beyond saying that, yes, their bloodlines can be traced by to "Kaguya Otsutsuki, who ate the Divine Tree's fruit." Basically it says that in the present day, faint traces of her power are all over the ninja world, giving the Byakugan as an example. It mentions that some clans which were destroyed had traces of her blood as well. I can't read the Kaguya clan caption very well (seems to just say, "they seem to be connected to Kaguya, don't they!?"), but the Hyuga one basically says that the legacy of the Byakugan goes back a thousand years (to Kaguya).