Pathology General pathology 854f5782 Major fibril protein in Primary Amyloidosis is - A AL B AA C Transthyretin D Procalcitonin High-Yield Explanation pathology text book harshmohan 7th edition. *AA-secondary amyloidosis. *transthyretin- heeditory neuropathic amyloidosis. *procalcitonin-endocrine amyloidosis.