Thrombopoietin is a human gene encoded by the symbol, THPO. It may also be known as: Megakaryocyte colony-stimulating factor; Megakaryocyte growth and development factor; MGDF; Myeloproliferative leukemia virus oncogene ligand; C-mpl ligand; ML; prepro-thrombopoietin; MPL ligand; MKCSF; MPLLG; THCYT1. The encoded protein has an amino acid length of 353 and a mass of 37.8 kDa. Other isoforms may exist. Thrombopoietin is a member of the EPO/TPO family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.