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. 2007 Jul 23;104(31):12749–12754. doi: 10.1073/pnas.0701762104

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© 2007 by The National Academy of Sciences of the USA

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Fig. 1. — Structure and steady-state spectroscopy. (a) X-ray structure of PAZ-Aib-Ala-(Aib)₆-OMe (molecule A, only the backbone is shown). The tags 1 to 9 refer to the corresponding absorption bands in b and count CO groups with increasing distance from the azobenzene moiety. (b) FTIR absorption spectra of the ¹³C-unlabeled reference molecule (PAZ-Aib-Ala-Aib₆-OMe, black line), and those of the ¹³C-labeled peptides PAZ-Ala*-Aib₇-OMe (red), PAZ-Aib-Ala*-Aib₆-OMe (green), and PAZ-Aib₃-Ala*-Aib₄-OMe (blue).

Inline graphic — Structure and steady-state spectroscopy. (a) X-ray structure of PAZ-Aib-Ala-(Aib)₆-OMe (molecule A, only the backbone is shown). The tags 1 to 9 refer to the corresponding absorption bands in b and count CO groups with increasing distance from the azobenzene moiety. (b) FTIR absorption spectra of the ¹³C-unlabeled reference molecule (PAZ-Aib-Ala-Aib₆-OMe, black line), and those of the ¹³C-labeled peptides PAZ-Ala*-Aib₇-OMe (red), PAZ-Aib-Ala*-Aib₆-OMe (green), and PAZ-Aib₃-Ala*-Aib₄-OMe (blue).