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Abstract
Details of the refinement of the side-by-side (SBS) model for the B (moist fibre) form of duplex DNA are presented. Initial atomic co-ordinates were obtained from a 2 cm = 1 A physical model by the theodolite measurements of atom positions. These were subsequently adjusted and refined to give bond lengths, bond angles and non-bonded intramolecular contacts within acceptable limits. Stereochemical features of the refined model are described and discussed in relation to a series of stereoscopic views of the model.