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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: Proteins. 2010 Nov 1;78(14):2961–2972. doi: 10.1002/prot.22819

Scheme 1.

Scheme 1

Schematic illustration of the hIDO reaction. ES2 and ES1 represent the protein-L-Trp complexes in Cf2 and Cf1 conformations, respectively. K2 is the L-Trp dissociation equilibrium constant of ES2, K21 is the equilibrium constant between ES2 and ES1 and kp is the rate constant of the chemical reaction.