TTF1 encodes the human gene, Transcription termination factor, RNA polymerase I. It may also be known as: Transcription termination factor 1; RNA polymerase I termination factor; Transcription termination factor I; TTF-I; TTF-1. The encoded protein has an amino acid length of 905 and a mass of 103.1 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.