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(a) Relaxivity at 37°C, 0.47T, pH 5 for Gd-bbu (0.42 mM) as a function of added HSA. (b) Hydration number q of Eu-bbu at pH 5 as a function of added HSA. At [HSA]/[Eu-bbu]=0, the triangle indicates measurements made on a visible aggregate while the circle indicates measurements made on the supernatant.
