Absolute Mag™ Streptavidin Magnetic Particles, Crosslinked Dextran-coated, Fluorescent Far Red, 100 nm (# WHM-M091) are synthesized as a core of magnetite and a coating of crosslinked dextran with far-red fluorescence (excitation: 732 nm, emission: 758 nm), having streptavidin surface. These magnetic nanoparticles are cluster-typed shaped and can be separated with conventional permanent magnets. Polydispersity index: < 0.2.