6W9A:
reference: The RING Domain of RING Finger 12 Efficiently Builds Degradative Ubiquitin Chains., Middleton AJ, Zhu J, Day CL, J Mol Biol. 2020 May 13. pii: S0022-2836(20)30333-8. doi:, 10.1016/j.jmb.2020.05.001. PMID: 32416094

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