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Molecular models of 30 base-pair B-form DNA double helices with lengths 10% smaller (top) and 10% larger (bottom) than the canonical length (center) preserve base pairing geometry and are sterically allowed. The models were produced using Rosetta with constraints on local rise parameters to induce compression or stretching (30). The starting model coordinates were generated by the DNA Star Web Server (31). The figure was rendered using PovScript+ (32).
