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1H-15N HSQC spectra of 15N-labeled LBT-DR/unlabeled KE (a), 15N-labeled KE/unlabeled LBT-DR (b), and 15N-Arg-labeled LBT-DR/unlabeled KE (c) in complex with Lu3+ (gray), Tb3+ (orange), Dy3+ (red), Er3+ (green), and Tm3+ (blue). Spectra were obtained using 800 (a and b) and 600 MHz (c) NMR spectrometers at 25°C
