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(a) Comparison of the backbone torsion angle α of the hexamer d(CACACG)·d(CGTGTG) with that of d(CACGCG)·d(CGCGTG). (b) Comparison of the backbone torsion angle ζ of the two hexamers. The hexamer d(CACGCG)·d(CGCGTG) follows the ZI conformation.
