4QZU:
reference: Structures of holo wild-type human cellular retinol-binding protein II (hCRBPII) bound to retinol and retinal., Nossoni Z, Assar Z, Yapici I, Nosrati M, Wang W, Berbasova T, Vasileiou C, Borhan B, Geiger J, Acta Crystallogr D Biol Crystallogr. 2014 Dec 1;70(Pt 12):3226-32. doi:, 10.1107/S1399004714023839. Epub 2014 Nov 22. PMID: 25478840

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