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Nuclear Magnetic Relaxation Dispersion profiles of Gd-L4 (open circles; dotted line), Gd-L5 (filled squares), and Gd-L6 (filled triangles). The best fitting curve for Gd-L4 was calculated with a model that considers a contribution of second hydration sphere water molecules (lower dotted line): q′=4, r′=3.9 Å, τR′=70 ps. Experimental conditions: 25 °C and pH = 7.4.
