4ZK7:
reference: Structure of a designed tetrahedral protein assembly variant engineered to have improved soluble expression., Bale JB, Park RU, Liu Y, Gonen S, Gonen T, Cascio D, King NP, Yeates TO, Baker D, Protein Sci. 2015 Jul 15. doi: 10.1002/pro.2748. PMID: 26174163

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