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Effects of a competitor peptide on CheR-induced changes in spectra of spin-labeled Tar. Normalized spectra for purified Tar, with spin labels at the indicated positions, in reconstituted proteoliposomes are shown without additions (black), with CheR at a concentration calculated to occupy ∼ 97% of accessible Tar-borne pentapeptide NWETF (red) and with CheR at the same concentration plus peptide EENWETF at a 10-fold excess relative to Tar-borne pentapeptide (cyan).
