Yin Healing Wound Destruction

Kabuto concentrates chakra to a prepared area of the body and begins the cell recreation process the very moment the targeted area becomes damaged. Kabuto claims that this technique is the reason that Orochimaru values him so highly: he can keep using test subjects for much longer than is normally feasible. The jutsu will continue to heal damage until Kabuto runs out of chakra, leaving the possibility that the damage will not be completely mended when the jutsu ends.

In the anime, after Tsunade returned to Konohagakure and gave her prognosis on Rock Lee's condition--thinking back to how she saw Kabuto withstood Naruto's Rasengan, Tsunade used Kabuto's technique as an inspiration to expand on the life-threatening operation and improve Lee's chances of survival.