One Piece: The user of the Nen-Nen Fruit, who overturned the sea.

With a roar,

The blue lines on the subject's skin suddenly turned black.

The muscles began to twist and swell uncontrollably, and finally...

"Bang!"

A cloud of blood mist bursts out in the scene.

When the blood mist dissipated, only a pile of unrecognizable chunks of flesh remained on the experimental table.

"Cellular breakdown caused by rejection reaction."

The doctor's voice was calm to the point of being cruel.

"The 'Berserk Factor' in the bloodline of the Demon Clan was activated, exceeding the tolerance limit of the test subjects."

Similar results occurred 203 times in 327 experiments, with a mortality rate of 61.9%.

He then pulled up another set of experimental footage.

"This is a bloodline transplantation experiment of the Lunaria race."

The subjects were also clones, injected with blood essence that had undergone four rounds of purification.

This time, the changes in the subjects were even more bizarre.

His skin gradually turned dark gold, and two fleshy growths began to appear on his back.

But just as the wings were about to take shape, the subject's entire body suddenly burst into black flames.

—Not the controllable flame of Ember, but an uncontrolled, destructive fire that burns everything.

Ten seconds later, only a pile of ashes remained on the test bench.

"The Lunaria Clan's 'Divine Fire Backlash'"

The doctor adjusted his glasses.

"The experiment had a success rate of 32.1% and a mortality rate of 67.9%. The only successful case was that the subject possessed a slight innate fire resistance."

Finally, there's Moria's experiment with mixed demon bloodlines.

This time the situation is more complicated.

The subjects not only exhibited characteristics of the demon race, but their bodies also began to grow larger.

But in the end, the test subject died with rapid breathing.

"Moria's bloodline is the most gentle," the doctor concluded.

"But it's also more complicated!"

"All the test subjects developed serious mental problems after receiving the initial transplant."

They exhibit stronger aggression and self-destructive tendencies.

The three sets of graphic data on the screen plunged the laboratory into a brief silence.

Kaido stroked his chin: "It seems the risks of a direct transplant are greater than we imagined."

The flames behind Ember flickered slightly: "61.9%, 67.9%... Doctor,"

Which scenario were you referring to when you mentioned a 70% success rate?

"That's the best-case scenario calculated by the theoretical model."

The professor brought up a complex formula interface.

"Assuming the subject possesses the physical strength of Lord Kaido, and the transplant process is 'bloodline stable'..."

Simultaneously, it is used in conjunction with the highest-level life support system...

The theoretical maximum success rate calculated this way is 70%.

Gracia paused.

"But the reality is that there are almost no subjects who can meet these three conditions. So the actual success rate we face... is probably less than 30%."

Roy frowned. "So your conclusion is that direct transplantation is not feasible?"

"At least not now. Without a strong physique and a powerful spirit, it's almost impossible to succeed."

"But perhaps it would be possible if the bloodline were diluted."

"It's too unsafe."

Roy shook his head helplessly, and after thinking for a moment, he thought of a key question.

"Doctor, why did these problems occur in the test subject after the blood injection?"

"The root cause lies in the 'hierarchical suppression' at the genetic level."

Dr. Gracia pulled up a complex set of genetic maps.

"Look, this is the gene sequence of a normal human."

"And this is Lord Kaido's Oni clan gene sequence, and this is Lord Jin's Lunaria clan gene sequence."

On the screen, the comparison of the three sets of gene sequences is clear at a glance.

The gene chain of ordinary humans is relatively "simple", consisting of a standard double helix structure.

However, the Ghost Clan's gene chain exhibits a violent "multi-helix" form, as if countless forces are intertwined within it;

The gene chain of the Lunaria race is even more unique, exhibiting a flame-like "fractal structure."

Each segment is self-replicating and self-optimizing.

"That's the problem."

The doctor pointed to the genome map,

"The genes of higher races possess a natural 'aggressiveness' and 'exclusivity'."

When these genes enter a normal person's body, they don't integrate obediently.

Instead, it will instinctively "devour" and "replace" the original gene sequences.

"If this process gets out of control, it can lead to the collapse of the host's genes—just like the experimental subjects you just saw."

Gracia pulled up a slow-motion video.

"Look at this. After the demon gene was injected, everything was normal for the first thirty seconds."

But starting from the thirty-first second, the demon race's genes began to replicate on a large scale.

It forcibly replaces the host's original muscle and bone genes.

The host's body could not withstand this drastic change, and ultimately...

In the video, the test subject's muscles swell up like an inflating balloon, then burst open with a "bang".

"What if the recipient itself possesses a higher-level bloodline?"

Roy asked,

"For example, have Kaido accept the bloodline of the Lunaria clan, or have King accept the bloodline of the Oni clan?"

"It's theoretically feasible, but the risks remain significant."

The doctor pulled up another set of simulation data.

"We've done the calculations; even with a physique like Lord Kaido's..."

The probability of rejection is over 40% even if one directly receives the complete bloodline of the Lunaria race.

Because the two superior bloodlines vie for dominance, a 'genetic battlefield' forms within the body.

The flames behind Jin flickered slightly: "So the dilution method won't work either?"

"Dilution can only reduce short-term rejection reactions, but it cannot solve the fundamental problem."

The doctor shook his head.

"Diluted bloodlines do integrate more easily, but the effects are greatly reduced. And once the host begins to grow stronger..."

The diluted bloodline will gradually 'recover,' but rejection may still occur at that time.

The laboratory fell silent once again.

It seems that the path of bloodline transplantation is much more difficult than imagined.

But at that moment, a light suddenly flashed in Roy's eyes.

"Doctor, what if we try a different approach?"

He said slowly,

"Nurturing it from within, rather than transplanting it from the outside?"

"Internal cultivation?" The doctor was taken aback.

"right."

Roy pointed to the genetic map on the screen.

"Since high-level bloodlines are aggressive, why don't we create a 'container'?"

Let them grow and fuse naturally inside the container? Then extract the results from the container once fusion is complete?

The doctor seemed to be deep in thought: "You mean...?"

"Could we use cloning technology?"

"clone?"

"That's right!" Roy's tone became excited.

"Could we use cloning technology to cultivate 'carriers' specifically for bloodline fusion?"

While this vessel is still an embryo, genes from the Oni race, the Lunaria race, and even more rare bloodlines are simultaneously implanted.

These genes will naturally fuse and adapt during the vector's growth process.

Roy spoke faster and faster,

"It's like extracting my bloodline and directly fusing it with three different bloodlines."

"Of course, this process must be based on my own bloodline and be directly cultivated."

"Once the experimental subjects mature, we can extract their genes for transplantation. Wouldn't this reduce the risk of rejection?"