5EN9:
reference: Crystallization of enantiomerically pure proteins from quasi-racemic mixtures: structure determination by X-ray diffraction of isotope-labeled ester insulin and human insulin., Kent S, Mandal K, Dhayalan B, Avital-Shmilovici M, Tokmakoff A, Chembiochem. 2015 Dec 28. doi: 10.1002/cbic.201500600. PMID: 26707939

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