The mechanical properties and the diameter of the B-form DNA.

For the isotropic cylinder model, we report C and g in consequence of choosing Young’s modulus and the diameter to satisfy S = 1100 pN and B = 230 pNnm2. For the helical model without major-minor grooves, the mechanical properties are calculated using D = 2.8 nm, 1/AR = 0.6, Ec = 411 MPa and Sr = 880 pN with the default helical parameters. For the helical model with major-minor grooves, the mechanical properties are obtained using D = 2.4 nm, 1/AR = 0.6, Ec = 668 MPa and Sr = 1100 pN with the default helical parameters.