Figure 2.

Build-up and decay curves for NOE intensities in different states of BLA at 20°C. The apparent cross-relaxation rates (σ) measured were 0.62 ± 0.01 s⁻¹ for the native state and 0.41 ± 0.01 s⁻¹ for the A-state; corresponding spin-lattice relaxation rates (ρ) were 2.67 ± 0.05 s⁻¹ and 2.49 ± 0.08 s⁻¹, respectively. The inversion-recovery spin-lattice relaxation rate for the native state was measured as 2.20 ± 0.08 s⁻¹; this rate, however, is averaged over all aliphatic protons, while the build-up rate is only averaged over those which experience substantial NOEs.