That's right, it's the medicine that Conan ateentailed, the reward that Natsuki chose after returning from the last world.

As we all know, there is a limit to the number of cell divisions in a human life, and every time the DNA is replicated during division, the telomeres in the cell will shorten by a segment, and when the telomeres are worn out, the chromosomes lose their protective umbrella and the cells die.

Therefore, most people do not live to be 120 years old, or even 70 years old, and die of various diseases before the telomeres are depleted at the age of 80, and the only cell that can break the spell of the number of divisions is only one type, that is, cancer cells.

No one wants cancer cells to appear in their body, so people will eventually die, and death is an inescapable fate, but with the development of science and technology, human beings can extend their life as much as possible, making it infinitely close to or even more than 120.

This led to the discovery of telomerase, a special reverse transcriptase enzyme that repairs defects in DNA replication so that telomeres are not lost due to cell division, increasing the number of cell divisions.

The principle of APTX4869 drug is to increase the proliferative ability of cells by inducing programmed cell death while enhancing the activity of telomerase.

Just because of the immaturity of this drug, there is a high probability that the user will die, but there is another possibility, that is, all the cells of the bones, muscles, internal organs, and hair of the user except for the nervous system have degenerated to early childhood.

Kudo Shinichi, as expected, is a man favored by death, and after taking the APTX4869, this almost zero chance probability is triggered, of course, for the needs of the plot, there is another woman who is favored by death, Miyano Shiho, that is, the later gray plain mourning.

At this glance, the probability of triggering a smaller one suddenly became very high, but Natsuki still didn't dare to just take the medicine like this, there was only one life, what should I do if I eat it to death?

That's why Natsuki found Orochimaru, and even didn't hesitate to fight against the Hokage World Death to keep his hands, in order to ask him to help him develop a flawless version 2.0 APTX4869.

Wannian elementary school students are just a joke, Conan's plot is so long is not that Conan will not grow up, but for the manufacturer to make this IP a classic and be able to earn more money, as for the plot to expand to Conan Elementary School, it doesn't matter if it dies an average of two people a day in the first grade of Conan Elementary School.

Looking at it this way, there is no problem with the effect of the APTX4869 at all, and Kudo Shinichi has an extra life of nearly ten years out of thin air.

"Undeveloped elixir, Mr. Orochimaru, your research in biology and medicine is unmatched, I need your help!"

After saying that, Natsuki looked at Orochimaru with burning eyes, and sent his most sincere invitation to this Hokage Great Scientist.

"Actually, it's an elixir!"

Orochimaru's erect pupils were full of surprise, and in his fifty years of life, he wanted to live forever but couldn't, so he could only retreat to the next best thing to develop immortal reincarnation, and ensure the immortality of his soul at the cost of constantly replacing his body.

But now someone told him that there was such a medicine that could rejuvenate and make new shoots grow on the rotten flesh, how could he not be surprised.

"I'm going to test it right away!"

"Of course, please!"

Natsuki followed Orochimaru to his underground base quickly.

"Pocket, prepare the lab equipment immediately, I want to test the composition of a drug!"

"Yes, Orochimaru-sama."

Seeing Natsuki in the pocket below was also stunned, but he still prepared the equipment when he heard Orochimaru's instructions, and soon Orochimaru completed the preliminary analysis of the APTX4869 with the assistance of Dou.

"It's amazing, it's so violent, it's so violent, and there's a molecular structure I've never seen before."

With his eyes off the electron microscope (check it up, the electron microscope came out before World War II), Orochimaru muttered, apparently he was deeply attracted to APTX4869.

This is exactly what Natsuki wants to see, he sees the possibility of immortality in APTX4869, but this is only a possibility, whether it can be verified by Orochimaru.

There are too many options for the traverser to solve the lifespan, and APTX4869 is only the first choice that Natsuki has encountered, and there will definitely be a second possibility, a third possibility, so Natsuki is not in a hurry, he still has a lot of time to be happy and pretentious.

So at this moment, he has another purpose.

"Mr. Orochimaru, I am relieved that I will let you study this medicine when I hand it over to you, but I still have a few small requests that I don't know if I can agree?"

"Requirements? As long as I can do it, Xia Shu-san, you can mention it at will! ”

"This drug has been experimentally documented, and only two of the hundreds of human experiments have been successful, these two are a man and a woman, and their bodies have all recovered to the size of a 7-year-old child after taking the drug, and it has been verified that drinking this wine can temporarily restore the physical state before taking the drug!"

As he spoke, Natsuki untied two bottles of white dry from his cousin from the storage scroll.

"I'm still young, and my biggest expectation for improving this drug is to control the degree of cell degeneration by controlling the dosage of the active ingredients of the drug, which means that I want to control the choice of physical age after taking the drug!"

That's right, that's Natsuki's purpose, it's too rigid to change back to the age of seven, what if the requirement for cultivating immortals is five years old? What if what kind of exercise cultivation requires a virgin?

Based on the APTX4869, the production of secondary drugs that can return to the specified age and the specified state will have more choices for Natsuki in the future, which is the real sense of the big practice to empty the archive and start over.

"I see, very constructive request, I will do my best!"

Orochimaru did not refuse Natsuki's request, he was a smart man, and he could figure out the meaning behind this request, but he was happy enough to be able to participate in the development of the real elixir.

His original body was still sealed like a specimen in a secret place at the moment, and perhaps when this medicine was really developed, he might be able to use it on that body.

As for Sasuke, who he has always coveted, wait for him to make his own choice, and he still hasn't untied the knot in his heart about Itachi's kaleidoscope writing wheel, maybe he still can't give up the reincarnation of the corpse when the medicine is successfully developed.

Natsuki didn't know what he thought about Orochimaru, but he still lived in this secret base for a while afterward, and Xu changed the direction of Orochimaru's research, and the shuttle energy rose to 96.4% after that day, and then slowly increased every day.

During this time, Natsuki didn't waste it, and consulted Orochimaru with some questions about the reincarnation of the filthy earth, and found that such a technique was not applicable in other worlds at all, so he gave up the study of this forbidden technique.

As Orochimaru's partner, Natsuki was allowed to enter Orochimaru's ninjutsu library, and although Natsuki couldn't learn those Five Elements Escape Techniques, he still used his mobile phone to take pictures of these ninjutsu scrolls with his mobile phone.

Here, for Xia Shu, the real treasure is those formations and all kinds of sealing techniques, for these things, Xia Shu did not refuse to take pictures, and prepared to slowly ponder and learn in the future, and integrate the essence of it into his own Maoshan Dao method, in that case, the Heavenly Master Realm is just around the corner.