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I am looking for a live-cell–impermeable dye for viability. (The cells cannot be permeabilized and fixed in this experiment.) I would prefer with excitation and emission spectra similar to Cy5, but I can be flexible here as long as the spectra are far away from Hoechst.

I have tried TOPRO3, but it seems to lose its brightness after a few exposures, so I would like something more resistant to photobleaching.

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You could try SYTO Orange. Unlike SYTOX, which is a fixed-cell marker, SYTO works with both live and fixed cells.

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