Karin was deeply worried about Uchiha Shunichi and clamored to come in and help. Unfortunately, Uchiha Shunichi's attitude was firm, leaving no room for negotiation.
After sending Karin out, Uchiha Shunichi activated the laboratory's defense system.
The laboratory's defense system was not some kind of barrier. Uchiha Shunichi had not understood such things at the time.
So the laboratory's defenses were actually just dozens of massive boulders piled up at the exit.
The reason for placing those boulders was not for safety, but simply because he did not want anyone interfering with his experiments.
Uchiha Shunichi had waited a long time for this experiment. If he had not been confident that he could gain sufficient strength in a short time, he would never have made this choice.
After all, even if Regression could erase the results of this experiment, his strength would return to what it had been before he injected the Hashirama Cell Fusion Agent.
After injecting the Hashirama Cell Fusion Agent, it would not take long to determine whether it had succeeded. As long as his body endured the initial mutation, it could be considered a success.
The so-called Hashirama Cell Fusion Agent did not directly replace a piece of flesh on his body. Instead, it was injected into the spine, using the drug to affect some of the stem cells.
Uchiha Shunichi called this process Assimilation... Once Assimilation was complete, the new stem cells would gradually begin replacing the old cells under the influence of chakra.
The first generation of assimilated stem cells was fragile and unstable, but after a period of fusion and division, the new stem cells would form a fresh, stable type of stem cell.
Afterward, those stable stem cells would merge into the body, allowing Uchiha Shunichi to begin growing again like a