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Solvent accessible surface areas (SASA) of phosphates groups for four RNAs with tertiary structure (Figure 1). (a) 58mer rRNA (1HC8), (b) the two monomers from the tetraloop-receptor RNA complex (2JYF), (c) A-riboswitch (1Y26), and (d) Tar-tar* (1KIS). Blue data points indicates SASA obtained with a probe radius of 1.4 Å whereas red points correspond to a probe radius of 2.8 Å.
