TY - JOUR T1 - Calculation of pKas in RNA: on the structural origins and functional roles of protonated nucleotides AU - Tang, C. L. AU - Alexov, E. AU - Pyle, A. M. AU - Honig, B. JO - Journal of molecular biology PY - 2007 PB - Academic Press VL - 366 IS - 5 SP - 1475 EP - 1496 ER -