6NJG:
reference: Dimerization of a ubiquitin variant leads to high affinity interactions with a ubiquitin interacting motif., Manczyk N, Veggiani G, Gish GD, Yates BP, Ernst A, Sidhu SS, Sicheri F, Protein Sci. 2019 Feb 21. doi: 10.1002/pro.3593. PMID: 30793400

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