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. 2008 Oct 1;105(40):15352–15357. doi: 10.1073/pnas.0805127105

Fig. 3.

Fig. 3.

EVV 2DIR spectra of pepsin and α-chymotrypsin measured with the PPS polarization configuration and delays of T12 = 2 ps, T23 = 1 ps (different intensity scales). The appearance of the tryptophan peak at ≈3,020/1,480 (labeled “Trp”) can be seen on the α-chymotrypsin spectrum.