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Approach to specific detection of Zn2+ via hyperpolarized magnetic resonance spectroscopy (A) Structures of [1-13C]Cys and [1-13C2]IDA. (B) Specificity of 50 mM [1-13C]Cys and [1-13C2]IDA for physiological cations (present at 1 equivalent). pH-dependence of chemical shift was measured at pH 7.4 and 6.5, the physiologically relevant extracellular range.
