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Granulocyte macrophage colony stimulating factor (GM-CSF), also called CSF-2, is mainly derived from T cells, monocytes, macrophages, endothelial cells, and fibroblasts. Among them, human GM-CSF is a 22 kD glycoprotein consisting of 127 amino acids. GM-CSF mainly acts on myeloid progenitor cells, exerts biological effects by binding with its high-affinity receptors. It rapidly enters the cell cycle to differentiate into granulocytes and macrophages, and finally becomes mature cells, which can prolong the life of mature cells and enhance the function of mature cells. It can not only promote the proliferation, differentiation and maturation of hematopoietic precursor cells, but also stimulate other cells to varying degrees, such as antigen-presenting cells (APC), fibroblasts, and keratinocytes.