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Abstract
The three isomeric guanylic acids (5'-GMP, 3'-GMP and 2'-GMP) and the 3':5'-cyclic derivative (cGMP) form, in water solution, left-handed columnar aggregates which, at higher concentration, pack to give left-handed cholesteric mesophases. The self-assembly process and liquid crystal formation are discussed in relation to the behaviour of the 2'-deoxy analogues.