Board Thread:Wiki Discussions and Support/@comment-2140588-20141128230913/@comment-24808887-20141128235058

From what i know(not much) it is more like Yin and Yang(not Yin-Yang): I think it is work this way.
 * 1) People have both Yin amd Yang as part of their existence
 * 2) All medics with known Natures has both(well i know only Sakura, Tsunade and Ino)
 * 3) Sasuke to heal after effects of tsukuyomi needed help of Tsunade
 * 4) Naruto used used Yin-Yang to do his Jesus things