3EYB:
reference: Structural and functional insights into the ligand-binding domain of a nonduplicated retinoid X nuclear receptor from the invertebrate chordate amphioxus., Tocchini-Valentini GD, Rochel N, Escriva H, Germain P, Peluso-Iltis C, Paris M, Sanglier-Cianferani S, Van Dorsselaer A, Moras D, Laudet V, J Biol Chem. 2009 Jan 16;284(3):1938-48. Epub 2008 Nov 4. PMID: 18986992

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