2665301 EtBr ethidium bromide 457 2665305 EtBr CsCl--ethidium bromide 1 2665307 EtBr ethidium bromide accumulation assay 1 2665304 EtBr Ethidium Bromide dye 1 2665310 EtBr ethidium bromide efflux 1 2665309 EtBr ethidium bromide gel electrophoresis 1 2665306 EtBr Etrium Bromide 1 2665312 EtBr extrusion machinery were highly dependent upon pump substrate 1 2665311 EtBr ligand-ethidiumbromide 1 2665308 EtBr orange-ethidium bromide 1