Recombinant human granulocyte colony-stimulating factor (hereafter referred to as G-CSF) is a 19.6 kDa glycosylated cytokine with proven efficacy against chemotherapy induced neutropenia [3, 4], for promotion of hematopoietic stem cell transplantation [5], in treatment of disorders of central nervous system [6, 7], in strengthening of the immune system of HIV patients [8] and for regeneration of heart tissues after myocardial infarction [9, 10]. The gene discussed is CSF3; the disease is neutropenia.