4ZPZ:
reference: A Versatile Strategy for the Semisynthetic Production of Ser65 Phosphorylated Ubiquitin and its Biochemical and Structural Characterization., Han C, Pao KC, Kazlauskaite A, Muqit MM, Virdee S, Chembiochem. 2015 May 22. doi: 10.1002/cbic.201500185. PMID: 26010437

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