Used in biomedical research to quantify levels of Cathepsin D, an aspartic protease enzyme, in biological samples such as cell lysates, tissue homogenates, and body fluids. The kit enables researchers to study the role of Cathepsin D in various physiological and pathological processes, including protein degradation, lysosomal function, cancer progression, neurodegenerative diseases like Alzheimer's, and apoptosis. It is commonly applied in oncology and neuroscience research to assess enzyme expression and activity changes under disease conditions or in response to therapeutic agents. The assay provides high sensitivity and specificity, allowing accurate measurement of Cathepsin D concentrations in research settings where understanding protease involvement is critical.