Cell Activation Technique

This technique is all about chakra. Tsunade was studying a technique that could stimulate simultaneously all the cells in a human body, task that demonstrated being hard even for her, the implication that there are delicate parts like organs between those cells become a major obstacle to complete the technique.

Trivia

 * When Rock Lee appeared almost recovered into the battle against Kimimaro, it was not clear if his recovery was the result of this technique.