1IE4:
reference: Structure of rat transthyretin (rTTR) complex with thyroxine at 2.5 A resolution: first non-biased insight into thyroxine binding reveals different hormone orientation in two binding sites., Wojtczak A, Cody V, Luft JR, Pangborn W, Acta Crystallogr D Biol Crystallogr 2001 Aug;57(Pt 8):1061-70. PMID: 11468389

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