Milas P, Gamari BD, Parrot L, Krueger BP, Rahmanseresht S, Moore J, Goldner LS. Indocyanine dyes approach free rotation at the 3' terminus of A-RNA: a comparison with the 5' terminus and consequences for fluorescence resonance energy transfer. J Phys Chem B. 2013 Jul 25; 117(29):8649-58.