The sparks actually erupted from the contact of the four fists, and in the flickering light, the Hulk's arms with huge strength clicked and snapped twice, and the huge body flew backwards for dozens of meters and hit the mountain wall.

Yu Nan knew that this guy had the super regenerative ability of a lizard, so he had to complete the plan while this guy was not yet strong, and he couldn't hesitate at all.

As soon as Yu Nan rushed in front of the Hulk at high speed, his fist was shot out in a series at a dazzling speed, and in the crackling sound, the stone wall behind the Hulk began to collapse and splash, but after a while, the Hulk had been driven into the stone wall several meters deep, and he roared to increase his anger, but Yu Nan broke his legs again.

The Hulk finally fell, his eyes flashing with green light stared at a knife that appeared in Yu Nan's hand, revealing a trace of rage and whispering:

"Who are you?"

Yu Nan was slightly stunned and said:

"Hey, I beat me so much that I can speak, your name is Hulk, right? What if my heart is filled with incomparable anger, if I want to kill you now, it will be as easy as trampling an ant to death;

You don't need to know what my name is, but I want to know if you want to live or if you want to end your life right there? ”

The Hulk appears to his ontological Bruce. Banner's personality will be hidden, so this Hulk is still very innocent, and he said with a hint of confusion in his eyes:

"Live, I need to live."

Who doesn't want to live, Yu Nan has to live in order to become normal in reality, and he has to live a long time, looking at the simple-minded but full of anger Hulk, the knife in Yu Nan's hand turned into a syringe and pierced into the Hulk's veins to draw out a tube full of green blood, and after turning into a glass bottle, Yu Nan grabbed the Hulk's limbs and quickly closed his broken bones into place.

A Hulk's recovery power can be normal in a maximum of ten minutes, Yu Nan stared at the Hulk's eyes and said:

"It's very simple to live, try to become stronger, maybe you can be my good sparring partner, come on, you'll recover in a while, maybe we can see each other again."

The Hulk nodded and said in a deep voice:

"Okay."

A simple word was already the best answer that could be given in the hulk's chaotic brain when he turned into Bruce. At Banner, there is only a glimmer of images left at most about Yu Nan's appearance, but when the Hulk appears, he can remember Yu Nan's appearance this time.

After beating the Hulk violently, Yu Nan knew how strong his current combat power was, he was completely using the evolved physical strength just now, but his weight had become more than ten times larger, and his attack power had increased more than ten times, compared to the dozens of tons of strength that the Hulk already had at this time, Yu Nan could easily crush him.

Yu Nan rubbed the messy hair on the Hulk's head and said:

"Okay, I'll look for you when I have time."

After Yu Nan finished speaking, he exited the cave that he blasted out of, and when he got out of the hole, he turned into a miniature person and flickered away, and after a while, the Hulk recovered from his injuries and ran out of the mountain to the city, but Yu Nan on the top of the mountain found a small cave and started his experiment.

The reason why the Hulk was able to mutate because of gamma ray irradiation is the special serum in his genes, and his special serum passed on to his father contains the gene fragment of lizard regeneration, and Yu Nan wants the reason why the Hulk's cells will become stronger and stronger after they increase, so his main research direction is to develop in this direction.

As a top geneticist, Yu Nan has much more advanced research equipment than this world, and he can turn into a miniature person for micro-observation, after more than ten days of research, he found that in addition to a substance that can combine cell mutations in the Hulk serum, there is also an independent factor that can continue to divide.

This factor does not allow cells to grow in size or make people recoverable, but it can divide and bind to the gene chain over time.

After careful testing, Yu Nan found that this factor combined with the gene chain will make the gene structure extremely stable, and the body formed by the combination of various cells formed by the gene chain will become stronger and stronger, and this limit seems to be unlimited.

With this discovery, Yu Nan gradually centrifuged out this factor of comparable size to quark from the Hulk blood sample, a large bottle of Hulk blood sample, which was only about one ten-thousandth of a microgram, Yu Nan tried to cultivate this factor, but finally chose to give up, the special factor is not affected by any energy from the outside world at all, and Yu Nan, who has become a miniature person after hundreds of tests, took a small syringe and looked at the transparent factor in it and muttered:

"This factor is not available in any organism, it can be combined with the gene chain to improve the stability of genes, I don't know if it has any impact on humans, but it's a pity that that's it, otherwise biological experiments can be carried out, and now it looks like I can only use myself as a guinea pig."

Yu Nan was bold, and at the same time, he also found that this factor was not destructive before he dared to do so, he took a deep breath and injected the special factor into his arm with the syringe of the change of the Shenshi Ruyi Soldier, and with the special factor entering the body, Yu Nan felt like he was soaking in a hot spring, and the whole person was a little dizzy and wanted to sleep.

After this feeling lasted for a day and a night, he returned to his normal body and took a blood sample from himself for testing, and when he saw that one of the gene chains combined with special factors became several times stronger than the other gene chains, he put away the test equipment with joy in his eyes and said:

"Now there is only one of the tens of millions of gene chains in my body that combines special factors, and my strength is obviously strengthened several times, if all gene chains are combined with special factors, and then the entire gene chain is strengthened, then the power will reach a realm that human beings cannot imagine.

However, the Hulk has grown larger because the regenerative cells catalyze the expansion of cells, and at the same time can accelerate the division of special factors, which is several times faster than me, but this kind of Hulk with lizard regeneration cells, it shouldn't be considered a pure person, right? ”

Yu Nan said and was silent, he didn't know if he was a pure person, judging from the structure of the gene chain and the composition of cells, he should be considered a human, but he was transformed by the mutation factor of fire ants, and he had the ability to stimulate his own hundredfold strength like an ant, and he also became a miniature person, which is no longer normal.

As soon as she talked about research, Yu Nan remembered Alicia who was still testing genetic blood samples for him in the biochemical world, and Alicia was still studying Yu Nan's genetic problems in the biochemical world, but she didn't know that Yu Nan had wandered around several worlds, and he planned to take the time to go to the biochemical world again to see how Alicia was researching.