5O44:
reference: The Crystal Structure and Conformations of an Unbranched Mixed Tri-Ubiquitin Chain Containing K48 and K63 Linkages., Padala P, Soudah N, Giladi M, Haitin Y, Isupov MN, Wiener R, J Mol Biol. 2017 Oct 27. pii: S0022-2836(17)30520-X. doi:, 10.1016/j.jmb.2017.10.027. PMID: 29111344

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