In the dim underground base, Shuimu looked with satisfaction at the face in the culture container that looked exactly like Shuimu's. Except for the fact that the skin was slightly wrinkled due to being immersed in the ** environment for a long time, there was no abnormality.

By extracting cell samples from this body, we can be sure that this is a very normal body. From the outside, it looks full of vitality, but in fact, the cell activity in the body is at a very low level. If it weren't for the obvious rise and fall between the chest and abdomen, I believe everyone would think it was just a drowned corpse.

"It's finally done. After a long wait, I finally got something."

"I am really lucky. I succeeded without taking any detours." The fake Jinchūriki standing in the shadows behind him also said with great relief, "The worry about the life span of my body's cells has come to an end."

"Well, thank you for your hard work." Shuimu's main body said happily, "It's hard for you to lead it in this environment all day long."

"You're welcome. When we exchanged memories just now, I've already experienced the rich and colorful experiences you had outside. Since our feelings are interconnected, it doesn't matter where we stay."

The fake Jinchuriki said.

"The fact that it was so smooth can only be said that we are standing on the shoulders of giants, and with the cheating device of Chakra, we can play the role of a mad scientist."

"That's just bragging."

Mizuki's body asked with a smile, "Well, without further ado, let's get started."

After saying that, Shuimu remembered something.

"Moonlight Gale, start preparing as well. Although it's definitely too late to completely cure him, if we hurry up we should be able to save his life."

"Yeah, I'll be there as soon as possible."

The fake Jinchuriki clone replied.

"The things that need to be done in the near future have almost been arranged. Once these are completed, we can start preparing for the next step."

…

After leaving the underground base, Mizuki stayed in the flower garden of the cabin in the back mountain for a while, waiting for Karin to pick the flowers before going back together. In fact, Karin no longer needs to do these troublesome chores. Even without the salary of work, Tsunade will give her enough living expenses. It's just that her insecure personality formed over the past ten years has made her more accustomed to this kind of work that can help others. Besides, Mizuki and Tsubaki are not a hateful couple.

"Mizuki-senpai seems very happy today."

During a break from work, Karin chatted with Mizuki who was leaning against the window basking in the sun.

"Is it so obvious?"

Karin nodded and replied, "The first time I saw Senior smiling so much was on our wedding day. Is there something good happening today as well?"

"What are you talking about? What if Xiaochun misunderstood? How can there be a happy event comparable to getting married?"

Shuimu touched his cheek and it seemed that he smiled unconsciously, and the muscles on his face were a little sore after such a long time.

"But, something good did happen, and it put my mind at ease."

"Really? That's good."

In late autumn, Xianglin leaned over again and carefully selected the few flowers that could be put on the shelves for sale.

"Have you put your worries to rest? This feeling is like finding a life-saving medicine for a terminal illness. Although I was prepared, the sense of accomplishment still makes me feel happy!"

That’s right, I finally found a solution to the physical problems that have been bothering me.

Ever since he understood the effect and working principle of this universal potion, Shuimu has been worried about the hidden dangers of his body. In order to solve this problem, he has delayed countless valuable researches, just to save his life before the deadline.

The principle of cell lifespan is actually very easy to understand. Every normal and active cell has a limit on the number of divisions. The root cause is the most fundamental genetic information of organisms - chromosomes. Every cell in the human body has this information, which controls all life activities in the body and is the key to a person's life, aging, illness and death.

Due to the low level of science in the ninja world, no one can understand these complicated things. Only a genius among geniuses like Orochimaru can make some achievements.

The structure of chromosomes is a double helix structure of DNA, which is known to everyone with a little knowledge of biology in the past life. The DNA in the cells controls the synthesis of corresponding substances to form various parts of the human body. At the same time, the cells themselves will continue to differentiate and divide to form individual human organs.

However, DNA is not something immutable, and the replication process is rather complicated. Moreover, DNA replication is not perfect during each cell division. In this chain DNA replication, a part will always be lost due to various reasons. Even in the most perfect state, the genetic material of the chain DNA will inevitably lose the telomere at the end.

This principle is easy to understand, just like two racks that match well one to one, there must be a vacant tooth at the head or tail end, without a corresponding match. DNA replication is due to similar reasons, and it is inevitable that more and more genetic material will be lost in each replication. This is the root cause of the limited number of cell divisions in all normal organisms. The external manifestation is even more obvious. The cell decay process is the aging process of a person. The metabolism of organisms, birth, aging, illness and death, are all produced in such subtle changes.

Mizuki was well aware of all this. The damage caused by the all-purpose potion was so huge and difficult to alleviate. To solve the hidden dangers of the body, the difficulty was like rejuvenating oneself, and it was the same level of problem as Orochimaru's reincarnation technique. If it was really that easy, would Orochimaru have to defect? ​​Why would he have to study reincarnation without a corpse? Mizuki, who had lived two lives, of course understood the great horror of this.

Mizuki had high hopes for the Turritopsis dohrnii, but the progress was so little that Mizuki wondered if his research was going in the wrong direction. It was not until he got the cells of the White Zetsu that he finally achieved obvious results.

That's right, the White Zetsu cells are Mizuki's last resort. Among the alternative life extension plans, the first is to reincarnate directly like Orochimaru, which was ruled out first. The second is to transplant the White Zetsu or the First Generation cells like Uchiha Madara, Uchiha Obito and Shimura Danzo, but unfortunately, this path was blocked after several experiments. Without the corresponding things to balance and limit the White Zetsu cells, none of the experiments succeeded, and all of his clones died. In the end, Mizuki chose a more difficult path.