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The structure of the B-DNA decamer d(CGCAATTGCG)2has been determined by X-ray diffraction analysis to a resolution of 2.3 Å and an R-factor of 17.7%. The decamer crystallises in the monoclinic space group C 2 and packs with a crossed arrangement of helices and a unique crossing contact distinct from all other decamer structures. This is believed to be a direct result of the sequence-dependent minor...