I Have A Super USB Drive

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

　　Different from high school, university final exams are generally not too difficult. They are all basic questions, all of which depend on the students' mastery of knowledge points.

In addition to professional compulsory courses, students in the College of Biological Sciences must also take the exams 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 a few non-stop examinations, the average student was dizzy. I don’t know what year it is.

　　 But it didn't matter to Chen Chen. Others needed to bring cheat sheets for exams, but Chen Chen had already learned through dozens of textbooks, even if he took the postgraduate entrance examination directly, it was just as good as the final exam.

　　 With several consecutive exams, Chen Chen has maintained the record of first handing in papers, and he has also established a reputation as a master in the second class of the Department of Biology.

After all, many people hand in the papers after seeing Chen Chen fill up the exam papers, and when the invigilators pick up Chen Chen's exam papers when they are bored, they are 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 conducted an unspeakable secret transaction.

　　 At the request of Li Bo and Zhou Jie, Chen Chen had to copy the answers to the multiple-choice questions to both of them every time they finished answering the questions, and the price was that they had to provide Chen Chen with boiling water for the entire semester starting from the next semester.

After signing this unequal treaty of power-bereavement and humiliation, the two looked at Chen Chen with a complex expression every time, but when they arrived in the examination room, the complexity turned into a savior-like eagerness. Pious.

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

　　 After a few days of dizzy examinations, finally, the freshmen of the Shanghai Jiaotong University ushered in the first holiday of their college career, and countless students who had left their hometown cheered and embarked on the journey home.

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

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

　　 Although Chen Chen's expression is very casual, every time a page is turned, all the knowledge on that page will be permanently imprinted in Chen Chen's mind, and he will never forget it.

　　 After a while, there was a brisk footstep outside the corridor, and then a girl with long hair in a shawl appeared at the door.

　　 The girl has a pair of bright eyes, clear and clear, and when she sees the two in the classroom, she smiles lightly, and the girl's unique youthful breath overflows.

"you are……"

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

"Hello, I am."

　　Although he didn't wear those black-rimmed glasses, changed a pair of contact lenses, and even painted makeup, these minutiae in Chen Chen's brain are no different.

　　 With Chen Chen's brain supplement, even if the woman in front of her is restored to her undressed form, it is soeary.

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

　　 "After all, it's a holiday. It's not too much to squeeze some time to clean up?" Xia Yin pretended to be annoyed, "Isn't it ugly?"

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

　　Wang Wei just wanted to speak, he realized something and coughed frantically.

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

After speaking, Chen Chen took out a thick printed material from his schoolbag and handed it to Xia Yin, "Stem cells, a type of cell in the human body that has unlimited self-renewal ability, and can differentiate into at least one type of progeny cells. "

"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, fat cells, etc.,"

　　 "The stem cells in the human body are working every day. Hair grows continuously, nails grow, and new cells replace aging cells every day. The source of these new cells is the various stem cells in the human body."

　　 "And my first experiment was about the therapeutic experiment of neural stem cells on brain damage."

Chen Chen explained, "Neural stem cells, as their name implies, are a type of adult stem cells that can repair nerves. The principle of the operation is: after implantation in the human body, it will stimulate the body’s own stem cells to automatically secrete cell growth factors—a type of small cells with a wide range of biological activities. Molecular protein to repair brain nerves."

"Stem cells are also divided into'self' and'alien'. As the name suggests,'self' is stem cells that originate from one's own body. By extracting their own stem cells, they are cultivated and grown by the outside world, and then injected into their own body. Stem cells do not have compatibility issues and avoid transplant rejection. They are the best choice."

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

　　 At this point, Chen Chen's expression gradually became serious, "...As for the autologous neural stem cells needed for the experiment, I will use two methods to obtain them: first, artificial cultivation; second, cloned from the clone."

　　 "Clone?"

　　Wang Wei was shocked, raised his head and said, "You want to conduct two batches of experiments, compare which neural stem cell is more effective?"

　　 "That's right, UU reading www.uukanshu.com is like that."

Chen Chen snapped his fingers, "Although the outside world has always been blowing stem cells into a fascinating, immortal proliferation, never aging, etc., in fact, if human stem cells can really proliferate indefinitely, why do humans age and die? So I want to see Look, since they are all autologous stem cells, will there be any difference in efficacy between artificially cultivated stem cells and cloned newborn stem cells?"

　　 "Then why not take an inducement method?"

　　 Xia Yin sat in front of Chen Chen and squeezed his chin with one hand. “The experiment will ultimately be for humans. Since we want to compare the differences between stem cells, the stem cells formed by the directed differentiation technology are more realistic, right?”

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

　　 Chen Chen explained, "Moreover, this technology is immature, and the induced stem cells are at risk of tumor formation and immune rejection."

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

　　 "Of course, you can try the rabbit, but don't forget about the cost and time. The pregnancy cycle of SD rats is 20 days, and the length of rabbits is twice as long. Time limits our experimental materials."

　　 "Well, I didn't want to be thoughtful." Wang Wei showed a sorry expression.

Then Chen Chen continued, "In the second experiment, I will destroy the spinal nerves of several rats, make them paraplegic at a high position without life-threatening, and then also cultivate stem cells to see if I can restore the rats' actions in this way. "

　　 "Then, it is the last experiment, and it is also the most important experiment in my opinion..."

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