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For example, it was found that certain mouse strains show resistance against systemic AA amyloidosis, due to mutations in the amyloid fibril precursor protein serum amyloid A (SAA). In this research, we find that the SAA1.5 and 2.2, two SAA-isoforms that underlie amyloid resistance in mice are unable to adopt the structure of pathogenic AA amyloid fibrils under conditions, where the pathogenic protein variant SAA1.1 does so. Furthermore, molecular dynamics simulations show that the pathogenic fibril structure does not tolerate the sequential changes present in SAA1.5 and 2.2 and becomes distorted by the variant sequences. 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