The Byakugan Reverse Jutsu Inscription transformed the Byakugan's original long-range vision into [Super Microscope Mode].
In this mode, the microscopic vision of the Byakugan was dramatically enhanced.
Medical instruments of this era weren't advanced enough to observe cellular structures directly—a longstanding obstacle for researchers.
But once reversed, the Byakugan immediately proved incredibly valuable.
Where once only vague cell outlines were visible, crystal-clear internal structures could now be seen.
With these visible cellular changes, Orochimaru and Shinno felt as if they'd just stepped into an entirely new world.
Their previous lack of deep understanding had stemmed precisely from insufficient research.
Orochimaru hadn't gone rogue yet, so he wasn't using human lives for experiments—and Shinno would never condone such methods either.
Now, however, they could directly observe internal cellular changes. With full activation, they could even view gene structures—a source of immense excitement for both men.
No more exorbitant costs, no need for endless human experimentation.
While conducting experiments, the two continuously observed through the Byakugan.
"This must be the inner structure of a cell... truly fascinating," he murmured.
Orochimaru linked the Byakugan's vision to a screen, constantly analyzing various cell structures and transformations.
These cells were anything but ordinary—most came from the bloodlines of powerful bloodline limit clans in Konoha and other hidden villages.
Under his observation, their cellular activity and structure were significantly more complex compared to ordinary villagers.
Noticing these differences, Orochimaru quickly realized these must be the core factors behind bloodline limits.
To uncover the secrets of bloodline inheritance, all they needed to do was understand these unique additional components.
"Orochimaru, focus on researching the Body Regeneration Jutsu. Once perfected, we can move onto other experiments," Shinno reminded him.
"That guy Satori Hyūga won't wait indefinitely."
Orochimaru bit his lip, reluctantly nodding and shifting his gaze away.
The truth—the ultimate truth and mystery of the human body—was laid bare before him.
Still, Satori Hyūga's situation remained urgent. He should focus on perfecting the techniques for his apprentice first.
Once the Body Regeneration Jutsu was perfected, it would also repay the debt of gratitude Satori Hyūga had granted him by offering the Byakugan for study.
Orochimaru deeply cared about his apprentices' affairs.
He also knew Byakugan always occur in pairs. After perfectly resolving Satori's physical issues, he'd definitely want to get his hands on the second Byakugan for further study.
"No wonder it's considered one of the three great dojutsu of the ninja world," Orochimaru praised, then began testing the improved [Body Regeneration Jutsu].
After thorough discussion, the two quickly outlined a detailed plan.
To improve the regeneration technique, they needed to study how cell division impacted cellular longevity.
Human body cells can only divide a limited number of times, which was why frequent use of Body Regeneration shortened lifespan.
By identifying what restricted cell division and modifying that limitation, they could indeed consider the technique improved.
If cells could divide infinitely without degrading, that individual might achieve a unique form of immortality.
[Fleshbound Immortality].
The secret to eternal life was finally within their grasp.
But everything had to wait until the research was complete—only then could they confirm whether it matched their hypotheses.
Orochimaru and Shinno led the research, with Satori Hyūga occasionally joining them to observe and study.
With his [Super-Microscopic Byakugan], research into cell division and regeneration accelerated dramatically. They soon uncovered the root cause.
After each human cell divides, its telomeres shrink slightly; these telomeres represent the number of times a cell can divide.
Once the telomeres shorten past a critical threshold, the cell loses its ability to divide, eventually leading to human death.
This wasn't set in stone, however. Through various experiments, the three had discovered several methods to replenish telomeres.
For example, infusing [Yang Release] energy during cell division could compensate for telomere loss.
Alternatively, administering specially-formulated drugs could halt telomere degradation entirely.
This meant that telomeres weren't irreplaceable after all.
Once practical solutions were confirmed, Satori Hyūga immediately began refining the [Body Regeneration Jutsu].
"Hope this works out well."
Within the silent confines of the Secret Chamber,
Satori sealed the door behind him, beginning his journey of transformation.
If it worked, he might gain a few more centimeters. If he failed, he'd probably never grow taller again.
Thinking about it, Satori couldn't help but let out a bitter chuckle.
"Back when I watched Dragon Ball, I laughed at Frieza for wishing on the Dragon Balls just to grow a little taller. Never imagined I'd do something like this someday."
All for the sake of growing a bit taller.
He even had to seriously wound himself to ensure Tsunade's method would work properly.
"Let's hope this works."
Inside the sealed room, Satori activated the Gentle Fist. In that cramped space, he swung his arms with full force, pummeling himself with brutal strikes.
Each strike delivered terrifying force, enough to tear tendons, shatter bones, and rip apart flesh from within.
In no time, a thin crimson mist drifted through the chamber, heavy with the metallic tang of blood.
Meanwhile, the heavily wounded Satori collapsed onto a nearby chair, his entire body radiating a faint green glow.
The green glow pulsed like swarms of insects burrowing into his flesh, altering his physical constitution.
The sensation was anything but pleasant—pure torture, as if countless bugs were gnawing at his muscles.
A few minutes later, the pain vanished completely, bringing Satori a sigh of relief—followed shortly by an exasperated groan.
"Damn it. Lasted only a few minutes. Probably didn't grow much at all."
Satori guessed the painstaking results wouldn't amount to much—his height probably hadn't changed significantly.
"Well, maybe if we make more progress in cell research, my body can evolve further."
His injuries were severe, and his consciousness was already beginning to blur. Without hesitation, he pressed a button on the chair and formed hand seals to activate the [Body Regeneration Jutsu].
As soon as he pushed the button, several syringes filled with dark brown liquid pierced straight into Satori's body.
As the liquid was poured into Satori Hyūga's body, [Body Regeneration Jutsu] also took effect.
A surge of dense chakra erupted from within, flowing through the pressure points and meridians, stimulating the muscle and flesh cells throughout his body.
The once grievously wounded body immediately began healing and regenerating at an observable rate.
Flesh, bones, internal organs, and more regenerated in succession, restored to their original condition.
The entire process occurred in lightning speed, taking no more than a minute.
The price? A massive depletion of his chakra reserves left him completely drained—he was in urgent need of restoration.
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