The G-CSF receptor (granulocyte-colony stimulating factor receptor) is a glycoprotein that acts as a receptor for granulocyte-colony stimulating factor (G-CSF) found on the surface of hematopoietic cells. It is part of the cytokine receptor family and is important in the regulation of the creation, differentiation and growth of hematopoietic cells. G-CSF is a growth-factor that is produced by different cells in the body like monocytes, macrophages, endothelial cells and fibroblasts.