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The relaxivity (20MHz, 25 °C) of GdDOTAM (open circles) and Gd4 (closed circles) plotted as a function of pH. The CEST contribution (MS/M0) from amide exchange (exchange peak at 80 ppm) in DyDOTAM is also shown (open diamonds); the line overlaid on these data is a simulation of the magnitude of CEST with increasing exchange rate from the Bloch equations modified for exchange.
