Abstract
Quantitative NMR study has shown a significant difference in affinity of 15 NH 4 + ions for cation binding sites with in G − quadruplexes adopted by d[G 3 T 4 G 4]2 and d[G 4(T 4 G 4)3].
We thank the Slovenian Research Agency (ARRS) and the Ministry of Higher Education, Science and Technology of the Republic of Slovenia (Grant Nos. P1-0242-0104 and J1-6140-0104) for their financial support.