Growth Hormone 1 is a human gene encoded by the symbol, GH1. It may also be known as: Somatotropin; Growth hormone; GH-N; Pituitary growth hormone; GH; GHN; IGHD1B; hGH-N. The encoded protein has an amino acid length of 217 and a mass of 24.8 kDa. Other isoforms may exist. Growth Hormone 1 is a member of the Somatotropin/prolactin family. Homologs of this gene exist in other organisms, including: Rat, Zebrafish, Frog.