For example, Transthyretin (TTR) and Serum Amyloid A (SAA) can be identified on both bone marrow biopsies and organ biopsies, usually invalidating an AL amyloidosis diagnosis and increasing suspicion for the respective types of amyloidosis (in our cohort, all patients had negative Anti-TTR and Anti-SAA). The gene discussed is TTR; the disease is AL amyloidosis.