Board Thread:Fourth Databook/@comment-4271790-20141104211032/@comment-4912646-20141104234736

Pwndkthnx wrote: Honestly, I assume medical jutsu are Yin and Yang. And I believe Kekkei Moura is basically the ability to mix 4+ bloodlines at once, while Kekkei Touta is mixing 3 bloodlines, and Kekkei Genkai is mixing 2 bloodlines (I wouldn't necessarily say bloodlines, but different natures and techniques).

Looks like medical is Yang, since all medics have it and it's a fairly logical conclusion. I guess that's the sort of thing we'll probably never be able to add though, unless we get explicit confirmation.