Latex beads, carboxylate-modified polystyrene, are widely used in biomedical research and diagnostics. They serve as essential tools in immunoassays, where their surface carboxyl groups enable easy conjugation with antibodies, proteins, or other biomolecules. These beads are also utilized in flow cytometry for cell sorting and analysis, as they provide a uniform and stable platform for detecting specific markers. In addition, they are employed in drug delivery systems, where their surface modification allows for targeted delivery of therapeutic agents. Their use in calibration standards for particle size analyzers ensures accurate measurements in various scientific applications. Furthermore, these beads are integral in creating model systems for studying cellular interactions and molecular binding events.