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The human granulocyte colony-stimulating factor (G-CSF) is a hematopoietic growth factor used to prevent and treat neutropenia. G-CSF stimulates the bone marrow to produce infection-fighting granulocytes. Food and Drug Administration of the United States approved G-CSF in 1991 and its PEGylated version in 2002 as a prophylactic and therapeutic measure against neutropenia. Recombinant human G-CSF is produced in surrogate host Escherichia coli and is PEGylated at N-terminal. Besides neutropenia, G-CSF is also used in bone marrow transplantati