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. 2013 Jul 9;110(30):12271–12276. doi: 10.1073/pnas.1310964110

Fig. 4.

Fig. 4.

Decomposition of X, the barrier of KSI’s chemical reaction. (i) Dissociation of androstene from KSI; (ii) uncatalyzed formation of the transition state; (iii) solution protonation of the transition state and deprotonation of the oxyanion hole; (iv) binding of transition state to KSI; (v) internal proton transfer.