3DE9:
reference: Control of protein oligomerization symmetry by metal coordination: C2 and C3 symmetrical assemblies through Cu(II) and Ni(II) coordination., Salgado EN, Lewis RA, Mossin S, Rheingold AL, Tezcan FA, Inorg Chem. 2009 Apr 6;48(7):2726-8. PMID: 19267481

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