1TTB:
reference: The x-ray crystal structure refinements of normal human transthyretin and the amyloidogenic Val-30-->Met variant to 1.7-A resolution., Hamilton JA, Steinrauf LK, Braden BC, Liepnieks J, Benson MD, Holmgren G, Sandgren O, Steen L, J Biol Chem 1993 Feb 5;268(4):2416-24. PMID: 8428915

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