TOOLS Fluo-Red is a magnetic bead with red fluorescent dye. The magnetic bead consists of a single-crystal Fe3O4 magnetic sphere core and is coated with dextran dispersed in phosphate-buffered saline (PBS) solution. The beads can be introduced into cells by microinjection, it can be used for microscopy, flow cytometry, and magnetic resonance imaging (MRI). This product is highly hydrophilic, bio-compatible, and easy to use for cellular imaging research.