Sytox Red

Sytox Red from Thermo Fisher Scientific is a cell-impermeant, fluorogenic nucleic acid stain that can be used as a viability dye for use in flow cytometry and as a nuclear counterstain in fluorescence microscopy. It has an excitation peak at 639 nm an emission peak at 655 nm, similar to To-Pro-3. see less Sytox Red from Thermo Fisher Scientific is a cell-impermeant, fluorogenic nucleic acid stain that can be used as a viability dye for use in flow cytometry and as a nuclear counterstain in fluorescence microscopy. It has an excitation peak at 639 nm an emission peak at 655 nm, similar to To-Pro-3.