Used in biomedical research to detect and quantify phenylalanine ammonia-lyase (PAL) enzyme activity in biological samples. This ELISA kit enables researchers to study PAL expression in human samples, which is important in understanding metabolic pathways related to phenylalanine metabolism. It is commonly applied in studies of phenylketonuria (PKU) and other metabolic disorders, as well as in monitoring therapeutic interventions targeting amino acid metabolism. The assay provides a sensitive and specific method for measuring PAL levels in cell lysates, serum, or tissue extracts, supporting both clinical research and drug development.