After explaining how to make a compound bow, Yeyu did not leave the factory, but stayed to help the strong man to get started, and he could be reminded in time if something was wrong.

A combination of parts in the night rain and the strong man's efforts appeared, 3 hours of night rain and strong men kept working, and finally after 3 hours all the parts were completed, night rain can't wait to combine all the parts one by one. The sound of the combination of "click-click" parts appeared in the factory, accompanied by the cutting of the last part into a large 1.2-meter-long composite bow appeared in Yeyu's hand.

Ye Yu looked at the compound bow in his hand and was excited, just when this was a strange thing, a small white electric current appeared on Ye Yu's body, and Ye Yu jumped, how shocked he looked at the arcs on his body and wondered: "This is.... Is this bioelectricity? ”

Yeyu had learned about it in his previous life, and he knew that no matter what species existed, bioelectricity was not very aggressive (the intensity of bioelectricity in different species was different).

How do normal somatic cells produce electricity? The cell is immersed in the cell fluid, there are many charged ions (potassium ions, sodium ions, chloride ions, etc.) inside and outside the cell membrane, potassium ions are mainly in the cell, sodium ions are mainly outside the cell, in the quiet state, these ions are relatively stable, when stimulated, the permeability of the cell membrane changes, various ions become active, flow inside and outside the cell membrane, potassium and sodium ion exchange occurs, and bioelectricity is generated.

The bioelectricity in the human body is very weak, and the strongest and most charged creatures in nature are the electric eel, and the bioelectricity in the electric eel can cause a normal human to faint.

"Ding, system prompt, congratulations to the host for obtaining the ability: bioelectricity"

Skill: Bioelectricity

Provenance: A weak arc of electricity is produced when the cells of the body are excited

Activation Condition: None

Skill Status: Sealed State (Skill Points Required, Light Up the Stars)

In fact, Yeyu also knows that this kind of electricity will also appear in the human body as the heart beats, and the human heart will produce a voltage of 1 to 2 millivolts. Similarly, every blink of the eye produces 5 to 6 millivolts, and reading or thinking produces 0.5 to 1 millivolts, and these voltages stimulate brain cells to remember things when humans think.

After a while, all the currents on Yeyu's body disappeared, and he didn't care about these, since there was electricity, this was a good thing, although these weak currents would not cause harm to the human body, but they were indeed deadly to those germs.

Night Rain ignored these for the time being, raised the compound bow, straightened his left arm and clenched the bow, and pulled the bowstring with his right hand. After trying the tension of the bowstring, Yeyu nodded with satisfaction, Yeyu's current strength is much stronger than other cells, if ordinary cells don't let alone pull the bow full circle, it will be difficult to pull this bowstring.

But Night Rain can't shoot arrows for a long time, because the string of this compound bow is also made of iron, and his fingers can't stand it for a long time, but that's enough.

Next, Night Rain discussed the production of arrows with the other party, and the production of arrows is very simple, as long as you make arrows. Night Rain can make the arrow body by yourself, and after explaining the style of cutting hair, Night Rain left the factory.

He was going to go to the dendritic cells where to ask for some branches, the branches were ready, and Night Rain found a quiet place to take out a dagger and start making arrow shafts, where is the quietest and safest, of course, it is the system space, and the next moment Night Rain's figure disappeared in place.

This time, Night Rain did not just enter the system space with the mind body as usual, but the body directly entered. I came to the bottom of the tree and sat cross-legged to watch the shaft of the arrow.

Time passed little by little, and in one night, Night Rain made more than 200 arrow shafts. After making the shaft, Night Rain flicks his arm, and then takes the shaft back into storage.

The next thing is to level up, and the amount of experience from the last battle for a whole week is enough for Night Rain to reach level 15. Click to upgrade the level of Night Rain to directly upgrade to level 15, 5 skill points, and 5 chances to draw.

Night Rain directly uses a skill point on the bioelectric skill, which is a passive skill, and when it is lit, he can attach a weak lightning attack to each attack.

With another skill point on the skill representing NK cells on the Evolved Star, Night Rain must prepare for the toughest battle in this body.

NK cells are a very powerful cell, NK cells, also known as natural killer cells (NK), are important immune cells in the body, which are not only related to anti-tumor, anti-viral infection and immune regulation, but also participate in the occurrence of hypersensitivity reactions and autoimmune diseases in some cases. It has a strong attack power, and when diseased or mutated cells (cancer cells, tumors) appear in the body, it is produced to fight and destroy these germs.

Thousands of cancer cells are produced in a healthy human body every day (but rest assured, the chances of cancer cells in the real world are very small), and a single mutation is not enough to turn a healthy cell into a cancer cell. A cell carcinogenesis requires several separate mutations in a cell that work together to induce cell carcinogenesis. According to statistics, 3~7 individual random mutations need to occur for a cell transformation.

Although cancer begins with a mutation in one cell, the offspring of that mutated cell must undergo several mutations. But once the mutation is complete and turns into cancer cells, thousands of these cancer cells are produced in a day.

Night Rain made a compound bow to deal with the cancer cells that appeared at the end of the anime, and the other diseased cells were just miscellaneous fish that could be used directly with a knife. His target is that cancer cell, as long as he devours the other party, he can obtain a powerful attribute, that is, infinite proliferation, and there is no upper limit of proliferation, which is an ability against the sky.

There are 3 skill points left, and Night Rain is not lighting up the stars, but stays in case of emergency. As the saying goes, be prepared, he still has skill points to use in case of emergencies, and he can directly light up his skills when he needs it.

After playing with his skills, Night Rain waved his right hand, and the stars in front of him slowly rose back to the area of stars that belonged to him. Next is the lottery, Yeyu didn't draw directly but asked the system: "System, can I directly choose 5 cards in a lottery?" ”

"Yes, but I want to remind the host in advance, first, you may get golden items by drawing only one card per lottery" Night Rain knows what the golden item the other party is talking about, that is, the fireworks after choosing the card, different colors of fireworks represent different grades of items, and so far Night Rain knows 3 different kinds of fireworks.