Now even Charlene has no solution, and now the crux has evolved into how to limit the ability of [Backtrack], it is like a double-edged sword, and the double-edged sword is undoubtedly the best weapon in the weapon, and if used properly, it can slash and kill the enemy on the battlefield, making the enemy frightened, but if it is not used properly, it may also affect itself.

This is very similar to the attribute of [Backtracking], on the one hand, the ability of [Backtracking] is of great help to Su Yuan, without it, Su Yuan would not be able to lead everyone to escape in the enemy's attack, but on the other hand, it is precisely because of the existence of this ability that the world cannot avoid falling into the quagmire of collapse.

This is the so-called one advantage must have one disadvantage, and now we know this, but the difficulty is that even if we do, there is no particularly effective way to limit [backtracking].

Su Yuan's experience in the previous world proved that even if she didn't use [Backtrack], as long as she still had the ability to use [Backtrack], then the world would collapse. This is a very fatal thing, because it means that until we have a thorough understanding of what [Backtracking] is and how it works, the only way to avoid the collapse of the world is to "Su Yuan disappears from this world".

This is obviously unacceptable to Su Yuan himself and even Xia Linfeng, not to mention that it is not enough for Su Yuan to disappear, Su Mengyuan in this world must also disappear with her. The answer that I have been searching for for so long is this--sacrifice myself to protect everyone! This is absolutely a great irony.

The choice is already in front of you, either you can find a solution to the [backtracking] in a limited time, or you can make a decision before the deadline comes. Whether to use the time machine again to jump in exchange for more time, or to simply end yourself.

There are actually three options. The best and brightest is of course the first, at least for Su Yuan. It's a perfect ending. If this hope cannot be achieved, then Su Yuan can only use the time machine to jump again, but at this time, it is quite a bit of a time to exchange action.

Now that he has the ancient head of the experiment notebook in his hand, if he still can't find the answer to [Backtracking] in the next few months, then Su Yuanzhi knows that even if she is given more time, the possibility of finding the answer is very slim.

Racing against time, and the future is uncertain, behind the struggle is only to survive. After a long time, you will be tired, sleepy, and tired. Instead of continuing to work himself, perhaps when his psychology is completely numb, Su Yuan will be willing to choose the last, worst, and most complete way to relieve himself.

That choice achieved righteousness, and also drew a perfect end to her failed and shallow life. We can even say that the human civilization that has avoided the end of the world because of her choice might have praised her great spirit at length if it had known about this historical event.

It's just that it's too early to say this, Su Yuan is a person who cherishes her life, as long as there is still a little hope, she will definitely not push herself into the abyss.

Next time. Su Yuan and Xia Linfeng were completely immersed in the experimental notebook left by the ancient head, with no distractions and no distractions! At this time, the things outside the window were no longer important to them who were shouldering a "major mission", and they devoted their bodies and minds to the analysis of the research done by the ancient head.

Time is running out for them. What's more, the experiments in the experiment notebook are getting more and more to the point, and they are gradually becoming obscure. Even Su Yuan, who is a biology major, and Charlene, who has expertise in biotechnology. I also had to slow down and keep up with the old head's train of thought little by little.

……

The mountain monk was puzzled. A leaf falls to know the autumn of the world, this is exactly the leopard in the tube. See a spot and know the whole body. Early autumn turns into late autumn, the weather gradually becomes cold, and the water in the bottle also freezes, making people sigh at the cold of the world, and time flies.

Su Yuan and the others have been working on the analysis of the ancient head for a while, and although it has not been completely completed, they basically have a general understanding.

It turned out that after solving the problem of culture medium and culture process, the focus of the experiment gradually led to the study of the cell itself. This is an inevitable process, and it is also the core task entrusted to him by Gao Peng. The work done is mainly to analyze the cell type, morphology, survival number, and cell viability, mainly through the direct analysis of medical and biochemical instruments at that time, and supplemented by fluorescently labeled cells.

In this process, the ancient head did not find any obvious differences from other cells, but I thought that since it was a genetic disease, most of the problems appeared in the mutation of the gene. So Gu Tou did not hesitate and shifted the focus of the experiment to "the extraction of genetic material".

At that time, the ability to detect genetic diseases was still very limited, but according to the information provided by Gao Peng, Gu Tou mainly focused on genes related to sex chromosomes. In this way, the workload is greatly reduced.

He first observed whether the cells in the experiment had excess or missing sex chromosomes, and after confirming that everything was normal, he began to test the genes on the sex chromosomes one by one.

It is important to know the shape of a chromosome, a long strand of DNA, which contains a large number of genes. Generally speaking, the occurrence of hereditary diseases is directly related to the occurrence of genetic errors, but it is also necessary to realize that as long as the coding region content of the gene part of the DNA chain is not wrong, the rest of the non-coding region content will not affect heredity even if there is a little error in the process of passaging.

Therefore, the ancient head does not need to check the entire long DNA strand that makes up the chromosome, but only needs to select the part of the gene for testing, which saves a lot of time. For example, the X chromosome contains 1,529 genes, and the Y chromosome contains 344 genes, and a single gene often contains thousands of base pairs.

Fortunately, the Human Genome Project was officially launched as early as 1990, and although it has not yet entered the harvest period, it has achieved considerable results in more than three years. As the Taishan Beidou in China's domestic biological field, Gu Shiguo is trying to promote the work of joining the Human Genome Project, and it can be said that there is a strong foreign aid front in this regard.

After leaving East China University of Science and Technology and officially joining the Institute of Cell Biology, Gutou began to compare these genes with limited scientific and technological achievements. But perhaps because of the sheer volume of work, or perhaps because the fledgling Human Genome Project had many flaws, the old man did not draw any conclusions from it.

Just when the old leader was at a loss and was about to lose his efforts, an occasional retrospective experiment made him make an unexpected discovery.

Once, the ancient head arranged for the graduate students to observe the cell structure, but this time there was a surprising discovery.

Under high magnification, the graduate student discovered an oval-shaped organelle with a significantly larger individual and distinct characteristics from the mitochondria. Let's call this thing an organelle, and it's three times the size of mitochondria!

At first, the graduate student thought that he had made a mistake in the multiple, but on second look, the multiple was not wrong, and the organelle and mitochondria clearly had different characteristics. Out of an abundance of caution, he told the old head about this phenomenon.

After learning about it, the ancient head paid great attention to it, and personally took tissue cells for homogenization, centrifugation, purification, and pre-microscopic treatment, staining, and finally he also observed this strange organelle. Compared to mitochondria, the two are very different.

"What's going on?" muttered Rao, an old man who had been in this professional field for decades.

"This organelle did not exist before, or was only very rare in the initial culture, and only very few cells had this type of organelle!" said Gu Tou in his experimental notebook, "As the number of cultured generations increased, this type of cell came to the fore and eventually became so numerous that it could be observed by experimenters." ”

Because of this discovery, the ancient head had to jump back to the previous step - "cell analysis". And this back-to-back analysis gave him another gain: it turns out that this kind of cell is not simply one more organelle, to be exact, it is two more organelles!

Both organelles are very similar in appearance, both are oval in shape and almost the same size, except that one is slightly more slender than the other, and the slightest attention can confuse them.

Both organelles have a robust two-membrane structure and contain the genetic material DNA inside. At this point, some problems have become clear, and these two organelles and the genetic material they carry are the root of all problems.

With this unexpected discovery, the research of the ancient head entered the fast lane, and the research once again entered the step of "genetic material extraction". The corresponding long strands of DNA were quickly extracted from each of the two organelles.

The next step is to sequence the long strands of DNA to find out what the genetic material carried by these two organelles does.

Moreover, the emergence of these two types of organelles has also raised a series of questions: why are there these two types of organelles in these cells, and are these two organelles self-replicating with the help of their own DNA when they are inherited, or are they completed by the action of DNA in the nucleus?

There is a vague speculation that these two organelles should be replicated under the action of their own DNA, just like mitochondria and chloroplasts, which shows that these two organelles are quite independent, and they are not encoded by the common genetic material in the nucleus!

But at the same time, only a few cells are present in the early stage, but a large number of cells appear in the later stage, does this result indicate that it is highly infectious? Or is it more tenacious than other cells in the same culture environment, and the survival of the fittest leads to a large increase in it? (To be continued......