When using fluorescent probes to image inside the body the fluorescence signal must be strong enough and last long enough to distinguish it from the background fluorescence, otherwise the signal is undetectable. Now, by linking two fluorophores, US chemists have created a probe whose properties may make it superior.rnNicholas Turro at Columbia University, New York, and coworkers developed the fluorescent probe, RuEth, which can be used to image RNA-rich regions in cells.
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