Immune cells are all cells that participate in and are related to the immune response, including T-lymphocytes, B-lymphocytes, and natural killer cells, which are differentiated from stem cells known as “universal cells”. Hematopoietic stem cells are a group of hematopoietic cells that are present in the hematopoietic material, can be self-renewed, and have a variety of differentiation potentials, as well as the ability to regenerate into various tissues and organs. They can be divided into three categories based on their developmental potential: totipotent stem cells, pluripotent stem cells, and monopotent stem cells (specialized stem cells). Therefore, both immune cells and hematopoietic stem cells are important cells in the human body, and both immune cells are differentiated from hematopoietic stem cells. For specific knowledge, consult a hematologist.