1AQB:
reference: Structure of pig plasma retinol-binding protein at 1.65 A resolution., Zanotti G, Panzalorto M, Marcato A, Malpeli G, Folli C, Berni R, Acta Crystallogr D Biol Crystallogr 1998 Sep 1;54 ( Pt 5):1049-52. PMID: 9757135

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