A widely used green fluorescent dye for following synaptic activity by staining synaptic vesicles at the synapse or neuromuscular junctions. Biotium offers several Nerve Terminal Staining Kits for staining brain slices with synaptic vesicle dyes.    &lamba;Ex/&lamba;Em: 510/625 nm (in MeOH); 480/598 nm (in membranes)  Red solid soluble in water  C30H49Br2N3  MW: 612      FM is a registered trademark of Thermo Fisher Scientific.