Latex beads, carboxylate-modified polystyrene, are widely used in biomedical research and diagnostics. They serve as solid supports for immunoassays, enabling the detection of specific proteins or antibodies through binding interactions. These beads are also employed in flow cytometry as calibration standards and for cell sorting due to their uniform size and surface properties. In addition, they are utilized in drug delivery systems, where their carboxylate groups allow for the attachment of therapeutic agents. Their stability and compatibility with biological systems make them valuable in various scientific and medical applications.