Transthyretin (TTR), formerly known as Prealbumin, is in vivo involved in the binding and transportation of the thyroxin hormone and retinol-binding protein. Mutations in TTR are associated with Familial Amyloidoticpolyneuropathy (FAP) which is a fatal disease, characterized by amyloid depositions found in visceral organs including the heart, liver and kidneys. TTR V30M is a common variant associated with FAP found in Sweden, Portugal and Japan.