Abstract Background Transthyretin amyloidosis (ATTR amyloidosis) is a rare. life-threatening disease caused by the accumulation of variant or wild-type (ATTRwt amyloidosis) transthyretin amyloid fibrils in the heart. peripheral nerves. and other tissues and organs. https://foldlyers.shop/product-category/polystyrene-flame-retardant/