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original model of Chengde Mao's DNA dodecahedron from Hierarchical self-assembly of DNA into symmetric supramolecular polyhedra: Yu He1, Tao Ye, Min Su, Chuan Zhang, Alexander E. Ribbe, Wen Jiang & Chengde Mao Nature, Vol 452| 13 March 2008| doi:10.1038/nature06597