The styryl dye RH237 is a fast-responding potentiometric probe that is primarily used for functional imaging of neurons. Excitation/emission data (below)  is for the dye in methanol. In cell membranes, the spectra of styryl dyes are typically blue-shifted by as much as 20 nm for absorption or excitation and 80 nm for emission.    &lamba;Ex/&lamba;Em (MeOH) = 528/782 nm  Dark solid soluble in DMSO  Store at -20°C and protect from light  C29H40N2O3S  MW: 496.71