P53 protein is involved in initiating the process of apoptosis, so that cells that are damaged and cannot be repaired die in apoptosis to maintain the healthy state of the body. So what is apoptosis? Apoptosis is the autonomous and orderly death of cells controlled by genes in order to maintain the stability of the internal environment of the body. In layman’s terms, apoptosis is the process by which the body removes abnormal, stunted and mutated cells from the body, so that the proliferation and aging of normal cells can be strictly controlled. For example, tumors, autoimmune diseases, etc.