Prealbumin TTHY_RANCA 153 Tadpole T3-binding protein Transthyretin Thyroid hormone-binding protein, with a much higher binding affinity for triiodothyronine (T3) than for thyroxine (T4). Probably transports triiodothyronine from the bloodstream to the brain. THBP MAYYNTLALLTIFIFSGAFHRAQGTHGEADSKCPLMVKVLDAVRGIPAAKLPVKVFKQNEDKSWDLISSGTTSSDGEIHNLATEEQFVEGIYKLEFATKRFWSKLGLTPFHEYVDVVFTANDAGHRHYTTAVLLTPYSFSTTAVVSDVKEAHV