Molecular Recognition in Purine-Rich Internal Loops: Thermodynamic, Structural, and Dynamic Consequences of Purine for Adenine Substitutions in 5'(rGGCAAGCCU)2 - Znosko, B. M.; Burkard, M. E.; Krugh, T. R.; Turner, D. H. (Biological Magnetic Resonance Bank, 2002)