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Amino acid sequence of RNase A and secondary structure assignment. The secondary structure elements are graphically represented, and were calculated with the program PROCHECK (Laskowski et al. 1993), helix α1 (residues 4–12), helix α2 (residues 25–32), strand β1 (residues 43–47), helix α3 (residues 51–59), and strands β2 (residues 61–63), β3 (residues 72–74), β4 (residues 79–86), β5 (residues 97–111), and β6 (residues 116–124). The mutated residues are underlined in the sequence.
