1OGW:
reference: Synthesis, structural and biological studies of ubiquitin mutants containing (2S, 4S)-5-fluoroleucine residues strategically placed in the hydrophobic core., Alexeev D, Barlow PN, Bury SM, Charrier JD, Cooper A, Hadfield D, Jamieson C, Kelly SM, Layfield R, Mayer RJ, McSparron H, Price NC, Ramage R, Sawyer L, Starkmann BA, Uhrin D, Wilken J, Young DW, Chembiochem 2003 Sep 5;4(9):894-6. PMID: 12964166

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