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Ribbon diagram of RNase Sa. The acidic residues changed to lysines are indicated in ball and stick representation. Also given is the percent solvent exposure of the side chain and the oxygens in the carboxyl groups estimated by the method of Lee and Richards ( 1971). The figure was generated with the program MOLSCRIPT (Kraulis 1991). The PDB identifier for RNase Sa is 1RGG (Sevcik et al. 1996).
