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We propose an Ashkin-Teller like model for elastic response of DNA moleculeto external force and torque. The base-stacking interaction is described in asimple and uniform way. We obtain the phase diagram of dsDNA, and inparticular, the transition from B form to the S state induced by stretching andtwisting. The elastic response of the ssDNA is presented also in a unifiedformalism. The close relation of dsDNA molecule structure with elastic responseis shown clearly. The calculated folding angle of the dsDNA molecule is$59.2^o$.

Ashkin-Teller formalism for elastic response of DNA molecule to external force and torque