Surgery

Nawaki said thoughtfully, "You mean that if Shin's poison sac and its entire associated circulatory system were transplanted into another person's body, there would be no rejection at all? And in exchange, the circulatory tissues in Shin's body would not suffer any loss either—they could even be assimilated by his body again and used to transplant another poison sac?

If we kept recycling them like this, wouldn't we be able to create a group of ninja who could use poison sacs?

And besides poison sacs, there are many biological organs in the Shinobi World with special functions. For example, eyes with ocular powers and hearts containing bloodline chakra could be transplanted into someone else through similar methods, allowing them to gain powerful abilities."

Orochimaru nodded excitedly. "As expected of Nawaki-kun. You came up with so many possible applications so quickly.

However, this kind of surgery places extremely high demands on Medical Ninjutsu. The entire circulatory system compatible with the organ must be transplanted perfectly, including delicate tissues such as nerves, blood vessels, and lymphatic vessels. There cannot be the slightest mistake. Otherwise, the surgery will not be perfect, and the transplanted organ will be unable to perform to its fullest potential.

Only a handful of people in the entire Shinobi World can carry out this kind of operation."

After listening, Nawaki nodded thoughtfully. No wonder Orochimaru had crudely amputated Shin's arm and given it to Danzo. That was simply killing the goose that laid the golden eggs.

So the surgical requirements for obtaining the power of the Sharingan through Shin were simply too demanding!

Moreover, as far as Nawaki knew, the Mangekyō Sharingan required not only ocular nerves, but also the support of brain nerves. Otherwise, it could not be controlled perfectly at all. Instead, like Kakashi, one's own strength