The human body is a huge cell kingdom， inhabited by about 40-60 trillion residents - cells. Cells are the basic units of the human body， and they go through a life cycle of growth， differentiation， aging， and withering. Diseases and aging of the body correspond to changes in the quality of cells. The health and strength of cells can inject new vitality into life. Especially during the epidemic， stem cells played a huge role in the treatment of severe patients with new coronary pneumonia. We gradually understand the importance of immune cells and stem cells， and they are shining in their respective fields.

　　However， as cells， what are the differences and similarities between stem cells and immune cells？ What are the functions of stem cells and immune cells respectively？ What are the popular stem cell therapy and immunotherapy now？

　　1. Stem cells and immune cells have different functions

　　We know that cells are the smallest units that make up the human body. There are more than 200 different types of cells in our body. They influence and cooperate with each other， each performing its duties， forming a cell kingdom.

　　The existence of any country requires both builders to build and maintain， and defense forces to protect against foreign enemies. The same is true for the cell kingdom in our body.

　　In cells， stem cells are builders and repairers， and immune cells are defense forces in the national defense force.

　　Stem cells are builders

　　Stem cells exist in most organs and tissues of the human body. They can replicate and renew themselves infinitely， and can differentiate into any cells and become any tissues and organs. Therefore， they are also called "universal cells". When our human body is still growing， stem cells undertake the basic construction of the cell kingdom. They rush to the front line of construction， and through continuous division and differentiation of new cells， they increase the types and number of cells in our body， and finally create a healthy human body.

　　Immune cells are defenders

　　The main function of immune cells is to eliminate foreign pathogenic microorganisms， aging cells， mutant cells and even cancer cells. When there is an invasion of foreign enemies， such as bacteria and viruses， immune cells are the defenders of the defense forces in the cell kingdom， responding quickly and destroying them. If there are traitors in the cell kingdom， such as normal cells mutating into cancer cells， immune cells will activate the security system to identify and eliminate them.

　　We live in a world full of bacteria, viruses and other toxic and harmful substances. Our bodies are constantly attacked by invisible microorganisms, but we are still alive and healthy. This depends on the protection of the human immune system.

　　The immune system is like the body's guard， and the guard is composed of immune cells. On the one hand， they play the role of removing bacteria， viruses， and foreign bodies; on the other hand， they eliminate aging cells and mutated cells in the body， laying the foundation for health.

　　The reason why the human body gets sick is that the immune cells lose the battle！

　　The reason for being defeated is not only the strength of the enemy， but also the weakening of one's own strength. In a series of "suicidal" behaviors of human beings， the immune system gradually disintegrated...

　　But when there are too many foreign invasions or too many internal rebels， and the immune cells cannot eliminate them all， our bodies will get sick.

　　Unfortunately， as we get older， the number and vitality of stem cells and immune cells in the body will continue to weaken. With regenerative medicine technology based on stem cells and immune cells， we can protect our health. Immune cells are the "best doctors" of the human body. If they are strong， you will be strong.

　　2. Different classifications

　　Stem cells

　　Because the functions of stem cells and immune cells are different， their classifications are also different.

　　Stem cells are actually a type of cells that are not fully mature and fully differentiated. They can replicate themselves and constantly renew themselves. It is precisely because of these special advantages of stem cells that they can differentiate into any cell， any tissue and organ. Therefore， they are also called "universal cells". If the human body is likened to a tree， the seeds buried deep in the earth are omnipotent stem cells， which can differentiate into a complete human body， just like a seed can grow into a towering tree;

　　The main branches of the tree can be likened to pluripotent stem cells， mainly including sub-totipotent stem cells and mesenchymal stem cells， which can differentiate into functional cells of multiple systems such as nerve cells， cardiomyocytes， liver cells， osteoblasts， etc.， just like the lush branches， leaves and fruits that can grow from each crown;

　　The branches at the end are specialized stem cells， such as hematopoietic stem cells， which can only differentiate into red blood cells， white blood cells， platelets， etc. of the blood system， just like the branches at the end can grow leaves and fruits.

　　Immune cells

　　Compared with stem cells， immune cells appear to be more competitive. In the entire family of immune cells， the main function is to clear other cells. Clearing foreign pathogenic microorganisms， aging cells， mutant cells and even cancer cells are all the work of immune cells. At present， NK， DC， CIK， NKT and other immune cells are widely used in clinical practice.

　　3. Different clinical applications

　　Immune cell therapy

　　Immunotherapy by activating or enhancing human immune cells is currently the most popular means of preventing and treating diseases.

　　NK and NKT immune cells are mainly used， and their cell-specific characteristics are used to broadly enhance immunity and prevent the occurrence of diseases.

　　In addition， the application of immune cells in cancer prevention， anti-aging and other fields is also in full swing.

　　Stem Cell Therapy

　　If immune cells are mainly used for cancer prevention and treatment， then stem cells are more inclined to tissue repair and chronic disease treatment. In addition to beauty and anti-aging， they can also be used in the treatment of various diseases.

　　With the increasing severity of aging， stem cells have also entered the clinic for the treatment of Alzheimer's disease. In the case of organ damage such as spinal cord injury and joint necrosis， stem cells can be used for repair and treatment.

　　Not only that， in cardiovascular diseases with the highest mortality rate， stem cells can also be used to treat acute ischemic stroke.

　　Although stem cells and immune cells are different in terms of source， function and application， they have all contributed to human health and disease resistance. I believe that with a deeper understanding in the future， stem cells and immune cells will be applied to a broader platform.

　　The 21st century is the era of cell therapy. In the future， the application of stem cells and immune cells will become a common means of clinical treatment. Storing cells will create unlimited possibilities for enjoying the development of future medicine.