Abstract
We report two-photon probes (FMg1 and FMg2) that can selectively detect intracellular free Mg(2+) ([Mg(2+)](i)) in live cells and tissues by two-photon microscopy. Combined with BCaM, a two-photon probe for near-membrane Ca(2+) ([Ca(2+)](m)), FMg2 allows dual-color imaging of Mg(2+)/Ca(2+) activities in live cells and [Mg(2+)](i) /[Ca(2+)](m) distributions in live tissues at a depth of 100-200 μm.
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