1PMP:
reference: Crystallographic studies on a family of cellular lipophilic transport proteins. Refinement of P2 myelin protein and the structure determination and refinement of cellular retinol-binding protein in complex with all-trans-retinol., Cowan SW, Newcomer ME, Jones TA, J Mol Biol 1993 Apr 20;230(4):1225-46. PMID: 7683727

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