Used to measure the activity of protein tyrosine phosphatase (PTP), specifically CD148, in human biological samples such as cell lysates, serum, or plasma. This ELISA kit enables researchers to quantify PTP activity in studies related to cell signaling, immune regulation, and cancer progression. It is commonly applied in biomedical research to assess changes in phosphatase activity under disease conditions or in response to drug treatments. The assay supports high-throughput screening and provides a reliable method for monitoring enzyme function in signaling pathways involving tyrosine phosphorylation.