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Modelling of various dA structures created with software ACD/ChemSketch using functions as follows: clean structure, check of tautomeric form and 3D optimization. Model of 3D structures for various lengths of (A) dA2; (B) dA3; (C) dA4; (D) dA5 and (E) dA10. Individual elements are represented by various colours as follows: hydrogen (black), nitrogen (blue), carbon (green), phosphorus (red).
