Sulforhodamine 101 has a longer absorption wavelength than does sulforhodamine B. Like sulforhodamine B and G, in addition to their potential use in cancer drug screening, these fluorescent dyes have been primarily used as polar tracers for the studies of neuronal cell morphology and cell-cell communication.     &lamba;Ex/&lamba;Em = 586/605 nm  Red solid soluble in water  Store at room temperature  C31H30N2O7S2  MW: 607  [60311-02-6]