The Symbiosis Institute is the headquarters for the Trill Symbiosis Commission and its related organizations, including its medical and training facilities. Tobin Dax had consulted doctors at the Symbiosis Institute when he thought he heard Lela Dax's voice inside his head; he was assured this was merely his imagination. (DS9 - The Lives of Dax short story: "Dead Man's Hand") Dr. Foris Hajan, senior member of the initate evaluation team, kept his offices at the Symbiosis Institute. (DS9 - The Lives of Dax short story: "Allegro Ouroboros in D Minor")