Huntingtin is a human gene encoded by the symbol, HTT. It may also be known as: Huntington disease protein; HD protein; HD; IT15. The encoded protein has an amino acid length of 3142 and a mass of 347.6 kDa. Huntingtin is a member of the Huntingtin family. Homologs of this gene exist in other organisms, including: Fly, Mouse, Rat, Zebrafish, Frog, Chicken.