They came to their brains, but were stopped at the door.

What stopped them was a huge wall, which looked like a Great Wall, but was not made of bricks, but made of a huge net.

[Blood-brain barrier: refers to the barrier between plasma and brain cells formed by the brain capillary wall and glial cells, and the barrier between plasma and cerebrospinal fluid formed by the choroid plexus. These barriers can prevent certain substances (mostly harmful) from entering brain tissue from blood.]

Every distance, there is a lookout on the Great Wall with guards standing on it.

The guards were wearing military green uniforms, holding long spears, staring at all the substances that were about to enter the brain.

Tang Yuan looked up and narrowed his eyes.

[Glial cells: also known as glia, are widely distributed in the central nervous system. All cells except neurons have about ten times the number of neurons in the central nervous system. They have the function of supporting and nourishing neurons, and also have the function of absorbing and regulating certain active substances.]

In the transparent mesh Great Wall, Tang Yuan saw that there were many libraries-like buildings located there, and these buildings were connected by another tree-like structure.

Those libraries live in many people wearing green clothes, looking like scholars.

"Who is the brain that is prohibited from visiting any cells." The guards on the watchtower scolded.

Tang Yuan touched his chin, and this was not easy to deal with. He almost forgot that there was a blood-brain barrier, and most substances with high hydrophilicity and large molecules could not be passed.

The material exchange here also relies on a carrier protein, and under normal circumstances, it is absolutely impossible for it to enter.

"What should I do? Do you have to try it?" Qi Zhi said, then rushed towards the mesh Great Wall. Then she was stopped by the big net and bounced back.

Wang Tianyi looked at Qi Zhi: "You are so big, you will definitely not be able to get through, and-"

The guards on the watchtower had already noticed their intentions and raised their guns in their hands and aimed them.

"Misunderstanding, misunderstanding, we just want to see if this wall is solid!" Wang Tianyi said with a smile.

"Netrophils, macrophages, B cells, and killer T cells. This is not a place you can stay. If you don't want to die, leave quickly."

"It seems that there is only one thing to retreat." Qi Xiu turned around and was about to leave, but was pulled back by Qi Zhi.

"Look at him, he hasn't moved yet." Qi Zhi pointed at Tang Yuan.

Tang Yuan stood there, as if waiting for something.

"He didn't give up, so there should be a way."

Tang Yuan did not give up. He waved his hands to the inside and signaled the person inside to come.

After all, the cells have been anthropomorphized, so this operation can still be performed.

Someone had noticed Tang Yuan inside, and he walked out of a library and arrived in front of the mesh-shaped city wall.

"Man, is there anything wrong?" the scholar asked with his neck tilted. He was puzzled. Generally, no one would come here. Their library was connected to almost all the neural intelligence networks, so as long as you stay in your brain, you can know everything.

"You know this world is in danger, right?" Tang Yuan asked.

The scholar nodded. He could not know the situation very well, but because he was not on the front line, he could not have the tragic feeling in his body.

As long as those viruses and bacteria do not invade the brain, there is still room for relief.

"The invading viruses are very powerful and mutating very quickly, so we can't tell them very quickly."

"Well, you're right, but all we can do is to constantly analyze new virus types and quickly develop response plans."

"This is too passive." Tang Yuan sighed. "We have to predict their subsequent actions before we can win this battle, and I have some clues."

"Well, we welcome people with ideas, but sorry, you still can't come in."

"I'm not going in," Tang Yuan replied. "If there is enough information, I will have a way to find out what disease is, so I hope you can help."

“What’s the busy thing?”

"I want you to show me all the memories about this disease."

"I'm sorry, you don't have the authority to view this." The scholar refused and was about to go back.

"Wait, don't rush to leave so quickly." Qi Zhi stood there, smiling leisurely. "We are all for world peace. Since he has a way to confirm this disease, why not try it first?"

Qi Zhi said in a gentle bass with a hint of mature women, which immediately made Tang Yuan think of those female anchors on late-night radio stations, and they were also talking in such a charming voice.

"But this does not comply with the regulations." The scholar stammered, mainly the woman opposite was too strong, and he could not refuse directly.

"Just say you want to read it yourself, then take it over and read it through the Great Wall in the mesh. It's the same. The rules are dead and created for talents." Tang Yuan said, and the other party was shaken, which means there was a chance.

"But..." The other party was still not completely convinced. Even if Qi Zhi kept persuading him, it would be useless.

"Please, just this time, it may be too forced to you. Then you can bring any book you can bring, as long as the time is the nearest."

"Okay." The other party replied happily.

Qi Zhi wanted to try harder to persuade him, but he didn't expect that the other party agreed so happily.

But she didn't know that in a place she couldn't see, Tang Yuan secretly grabbed the blue virus's hat and shook it at the scholar.

"If I don't show it to me, I'll try something else I can get in?"

The scholar's face suddenly changed: "You... dare not..."

"Oh? Do you think I dare?" As he said that, Tang Yuan stretched his hand holding the blue hat towards the mesh structure. "It's very convenient to get in at this size."

This man had a smile on his lips and a gentle look, but the scholar just felt his whole body numb. He believed that this gentle man could do anything.

So what if he is the neutrophil in this world? As long as he wants to release the virus, he doesn't care about anything.

[When necessary, moderate negotiation is also a way to make the other party submit.]

[Note: Moderate negotiations and appropriate threat effects are awesome.]

The scholar went back to get the information, but he came back soon. He sat directly on the ground and looked at Tang Yuan outside the mesh wall.

"Read it."

“…Gender: Female; Volunteer No. 001.”

"Statement: I came to be an experimenter voluntarily, and no matter what happens, I will voluntarily bear all consequences."

"I started coughing and sneezing in the early stages of the virus injection. This should be an inflammation-like reaction caused by the body when receiving stimulation. They told me that I don't have to worry at all. As long as I survive this period, I will be the first evolver."

"But it seems that the situation is getting worse and worse, but I have not given up on hope and have been persisting and not losing my mind. I will definitely...become the...that person who changed history..."

The scholar raised his head and shrugged: "This is the only relevant information, which is the medical record or diary in the memory of 'our'."
Chapter completed!