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CEST effect of 10 mM complex in 100 M NaCl, 20 mM HEPES (purple), egg white (green), 100 mM NaCl, 20 mM HEPES in 4% agarose gel (w/w) (red), and rabbit serum (blue) with a radio frequency presaturation pulse applied for 2 s, B1 =24 μT at 37 °C, pH 7.3–7.5.
