Sensing within the cell: Microspheres (2 μm) covalently loaded with calcium sensors can be delivered efficiently into living cells to analyze the intracellular changes in the concentration of Ca2+ ions in real time. The figure shows the real-time ratiometric fluorescent analysis (400/475 nm ratio) of the release of Ca2+ ions in cells loaded with the microspheres.
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Sánchez‐Martín et al. (2006) studied this question.
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