
Curves describing the variation of the Hill coefficient (nHill) with the divalent metal-ion folding midpoint according to models 1 (solid lines; see equation 5) and 2 (dashed lines; see equation 6) for folding of P4–P6 variants in Mg2+ (A) and in Mn2+ (B) in a background of 2 M NaCl. The data points are the experimentally estimated values of nHill and [M2+]1/2 for each individual RNA construct (Table 1).










