Medical Definition of GRANULOCYTE-MACROPHAGE COLONY-STIMULATING FACTOR
: a colony-stimulating factor produced by T cells, macrophages, endothelial cells, and fibroblasts that promotes the differentiation of bone marrow stem cells, stimulates the maturation of precursor cells into granulocytes and macrophages, and activates mature macrophages—abbreviation GM-CSF; see sargramostim
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