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The four most representative structures determined for TS1 (structures a–d) and for TS2 (structures e–h) obtained by using a clustering procedure (15). Only the side chains of those residues involved in electrostatic side-chain-to-side-chain interactions probed by the ΦIJ-values are shown to illustrate their variability in the transition state ensemble. Only those elements of secondary structure than span at least two residues have been highlighted.
