Used in biomedical research to quantify levels of peptidyl prolyl cis-trans isomerase (PPI) in biological samples such as cell lysates, serum, and plasma. This assay helps study protein folding processes and cellular stress responses, as PPI enzymes play a key role in regulating protein conformation. The kit is widely applied in neuroscience, cancer research, and immunology to investigate disease mechanisms where protein misfolding or PPI activity is altered. It enables high-throughput analysis in drug development studies targeting PPI inhibitors. Results are used to assess biomarker potential and evaluate therapeutic efficacy in experimental models.