<prompt> Major fibril protein in Primary Amyloidosis is?ALAATransthyretinProcalcitonin  <response>: Ans. a ALRef: Robbins 9thpg 257-260AL protein is made of complete Ig light chains, amino- terminal fragments of light chains, or both.Most of the AL proteins are composed of l light chains or their fragments, but in some cases k chainsThe amyloid fibril protein of the AL type is produced from free Ig light chains secreted by a monoclonal population of plasma cells, like multiple myeloma. 