3A33:
reference: Crystal structure of UbcH5b approximately ubiquitin intermediate: insight into the formation of the self-assembled E2 approximately Ub conjugates., Sakata E, Satoh T, Yamamoto S, Yamaguchi Y, Yagi-Utsumi M, Kurimoto E, Tanaka K, Wakatsuki S, Kato K, Structure. 2010 Jan 13;18(1):138-47. PMID: 20152160

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