3U2J:
reference: Hydrogen-bond network and pH sensitivity in transthyretin: Neutron crystal structure of human transthyretin., Yokoyama T, Mizuguchi M, Nabeshima Y, Kusaka K, Yamada T, Hosoya T, Ohhara T, Kurihara K, Tomoyori K, Tanaka I, Niimura N, J Struct Biol. 2012 Feb;177(2):283-90. Epub 2012 Jan 11. PMID: 22248451

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