I Have A Super USB Drive

Two days later, the 20th grade freshman ushered in the first final exam of his college career.

Different from high school, the final exams in universities are generally not too difficult. They are all basic questions that give points, and they all depend on the students' mastery of knowledge points.

In addition to the required professional courses, the students of the School of Biological Sciences also have to take the examinations of "Bioethics", "Linear Algebra", "Inorganic and Analytical Chemistry", "Natural Science", "Organic Chemistry", "Advanced Mathematics", "University Physics" , "Introduction to Biology" and other basic compulsory courses.

After several non-stop exams, the students were dizzy and didn't know what year it was.

But for Chen Chen, it didn't matter. Others needed to take cheat sheets in the exam, but Chen Chen had already read through dozens of textbooks. Even if he took the postgraduate entrance exam directly, it would be a bit of a mess, let alone the final exam.

With several consecutive exams, Chen Chen maintained the record of the first place in the paper, and he also completely established his reputation as a top student in the second class of biology.

After all, many people turned in the exam papers after seeing Chen Chen fill them up, and when the invigilators picked up Chen Chen's exam papers when they were bored, they were all surprised, not the look of being so angry , obviously the error rate is not high.

So, after another exam, Li Bo and Zhou Jie forcibly dragged Chen Chen back to the dormitory and made a secret transaction that could not be said.

At the request of Li Bo and Zhou Jie, Chen Chen had to make a copy of the multiple-choice questions for the two of them after each answer, and the price was that they would have to drink water for Chen Chen for a whole semester starting from the next semester.

After signing this unequal treaty that humiliated people, the two looked at Chen Chen with a complicated expression every time, but when they got to the exam room, that complicated expression turned into a savior-like eagerness and harmony. pious.

In the midst of this pain and earnestness, Li Bo and Zhou Jie secretly vowed that they must study hard at the beginning of the next semester, and strive to turn into a serf and sing before their sophomore year.

After a few days of dark exams, finally, the freshmen of Shangdu Jiaotong University ushered in the first vacation of their college career, and countless students who had left their hometowns cheered and embarked on their journey home.

As the campus gradually became deserted, after Chen Chen and Wang Wei sent away Li Bo and Zhou Jie, they made an appointment with Xia Yin to meet up and prepare for the experiment.

In an empty teacher, Wang Wei was looking at the thick experimental materials, and Chen Chen was opening a textbook on cell biology.

Although Chen Chen's expression was very casual, every time he turned a page, all the knowledge on that page would be permanently imprinted in Chen Chen's mind and could never be forgotten.

After a while, brisk footsteps came from outside the corridor, and then, a girl with shawl and long hair appeared at the door.

The girl has a pair of bright eyes, which are bright and clear. When she sees the two people in the classroom, she smiles slightly, and the girl's unique youthful atmosphere overflows.

"You are……"

Watching the girl walk into the classroom, Wang Wei quickly stood up and said in amazement, "Miss, are you Xia Yin?"

"Hello, I am."

Although he didn't wear the black-rimmed glasses, changed a pair of contact lenses, and even put on makeup, these details were as if they didn't exist in Chen Chen's mind.

Based on Chen Chen's brainstorming, even if the woman in front of her was restored to her unclothed form, it would be so eary.

"Why this dress?" Chen Chen pretended to be surprised.

"After all, it's a holiday, so it wouldn't be too much to take some time to clean up?" Xia Yin pretended to be annoyed, "Isn't it good-looking?"

"It's pretty, I thought it was the kind of rich...cough cough cough!"

Just as Wang Wei was about to speak, he realized something and coughed wildly.

After introducing the two to each other, Chen Chen led the topic to the main topic of this time, "This time, there are three experiments I tentatively planned, all of which are related to autologous stem cells."

With that said, Chen Chen took out a thick printed document from his schoolbag and handed it to Xia Yin.

"Stem cells, a type of cell in the human body with unlimited self-renewal capacity and the ability to differentiate into at least one type of progeny cell."

"For example, hematopoietic stem cells can differentiate into red blood cells, white blood cells, platelets, etc.; skeletal mesenchymal stem cells can differentiate into bone cells, chondrocytes, muscle cells, adipocytes, etc.,"

"Stem cells in the human body work every day, hair grows, nails grow, and new cells replace senescent cells every day, and the source of these new cells is the various stem cells in the human body."

"And my first experiment was a therapeutic experiment with neural stem cells on brain damage."

Chen Chen explained, "Neural stem cells, as the name suggests, are adult stem cells that can repair nerves, and the principle of the operation is: after implantation into the human body, it will stimulate the human body's own stem cells to automatically secrete cell growth factors - a type of small cell with a wide range of biological activities. Molecular proteins, thereby repairing brain nerves."

"Stem cells are also divided into 'autologous' and 'allogeneic'. As the name suggests, 'autologous' is stem cells derived from one's own body, which are extracted and grown from outside, and then injected into one's own body. Stem cells do not have compatibility issues, avoid transplant rejection, and are the best choice."

"In this experiment, we need to create a model of brain damage, so it is better to use SD rats than Kunming mice. After all, larger animals are easier to operate."

Speaking of this, Chen Chen's expression gradually became solemn, "...As for the autologous neural stem cells required for the experiment, I will use two methods to obtain them: first, artificial cultivation; second, extraction from the replica body through cloning."

"clone?"

Wang Wei was startled, raised his head and said, "Do you want to conduct two batches of experiments to compare which neural stem cells are more effective?"

"That's right, that's it."

Chen Chen snapped his fingers, "Although the outside world has always bragged about stem cells, claiming to be infinitely proliferating, never aging, etc., but in fact, if human stem cells can really proliferate indefinitely, why do humans still age and die? That's why I want to see Look, since they are all autologous stem cells, will there be a difference in efficacy between artificially cultivated stem cells and cloned new stem cells?"

"Then why not take the inducement approach?"

Xia Yin sat in front of Chen Chen, leaning on her chin with one hand, "The experiment is ultimately for humans. Since we want to compare the differences between stem cells, stem cells formed by directional induced differentiation technology are more realistic, right?"

"The preparation technology of targeted induced stem cells is too complicated and the cost is high."

Chen Chen explained, "Also, this technology is not mature, and the induced stem cells have the risk of tumor formation and immune rejection."

"We can also try to clone other animals, such as rabbits." Wang Wei suggested.

"Of course, rabbits can try it, but don't forget about the cost and time. The gestational cycle of SD rats is 20 days, and that of rabbits is twice as long, which limits our experimental materials."

"Well, I didn't think about it." Wang Wei looked apologetic.

Then Chen Chen continued, "In the second experiment, I will destroy the spinal nerves of several rats so that they can be paralyzed in a high position without endangering their lives, and then I will also grow stem cells to see if I can restore the rats' movement in this way. "

"And then, the last experiment, and the one that I think is the most important..."

Chen Chen's expression gradually became solemn, "The first two experiments are nothing, they have been done all over the world, while the third one is different and has to do with rebuilding the immune system."