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Smart Magnetic Resonance Imaging Agents that Sense Extracellular Calcium Fluctuations

Image brain function: Gd3+ chelates linked to a modified EGTA moiety were prepared in order to respond to extracellular Ca2+ fluctuations in the brain. Upon interaction with Ca2+, they exhibit high and reversible relaxivity changes in buffered solution or in a model of the brain extracellular medium. These efficient Ca2+ magnetic resonance imaging sensors might open new perspectives in functional molecular imaging.