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. 1999 May 11;96(10):5498–5503. doi: 10.1073/pnas.96.10.5498

Figure 2.

Figure 2

Time traces of absorbance changes at 1741 cm−1. Data are from step-scan experiments at different pH values. The negative signal at late times is attributed to deprotonation of D96 during the lifetime of the N intermediate. It is a measure of the transient concentration of deprotonated D96.