Peroxidase from horseradish is widely used in biochemical research and diagnostic applications due to its ability to catalyze the oxidation of various substrates in the presence of hydrogen peroxide. It is a key component in enzyme-linked immunosorbent assays (ELISA) for detecting antibodies or antigens in biological samples, enabling the visualization of immune reactions. The enzyme is also employed in immunohistochemistry to stain tissues and identify specific proteins or markers in cellular structures. Additionally, it is utilized in biosensors for detecting hydrogen peroxide and other analytes, making it valuable in environmental monitoring and medical diagnostics. Its role in producing chemiluminescence is exploited in Western blotting and other techniques for detecting proteins with high sensitivity.