Thiazole orange (TO) is commonly used in reticulocyte analysis to stain residual RNA of blood cells, to stain DNA in agarose gel and capillary electrophoresis. Thiazole Orange also functions as a fixable live-cell nuclear/cytoplasmic stain in yeast cells. Supplied at 10 mM in DMSO.    &lamba;Ex/&lamba;Em  = 512/533 nm (with DNA)  Store the solution at 4°C and protect from light