FM4-64 (SynaptoRedTM C2) is a styryl dye that stains stably but does not fluoresce in aqueous solution.FM4-64 does not passively diffuse into the plasma membrane bilayer and must be actively transported across the membrane.FM4-64 can be used to study cytotoxicity, cytosolization, and vesicular transport.Cephalexin monohydroxylin monohydroxylin (Cephalexin monohydroxylin) can be used to study cytotoxicity and vesicular transport.