| 2O6N: reference: Structure of a designed, right-handed coiled-coil tetramer containing all biological amino acids., Sales M, Plecs JJ, Holton JM, Alber T, Protein Sci. 2007 Oct;16(10):2224-32. Epub 2007 Aug 31. PMID: 17766380 |
This OCA 
Structure page
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(documentation).