Latex beads made of polystyrene are widely used in biomedical research and diagnostics. They serve as calibration standards in flow cytometry, helping to align and calibrate instruments for accurate cell analysis. These beads are also employed in immunoassays, where they act as solid supports for attaching antibodies or antigens, enhancing the detection of specific biomolecules. In cell culture, they are utilized to study cell adhesion, proliferation, and signaling pathways by simulating extracellular environments. Additionally, polystyrene latex beads are used in the development of drug delivery systems, where they can encapsulate or carry therapeutic agents to targeted sites in the body. Their uniform size and surface properties make them valuable in various scientific and industrial applications.