Used for the quantitative determination of Protein Phosphatase (PP) activity in rat biological samples such as tissue homogenates, cell lysates, and serum. This ELISA kit enables researchers to assess phosphatase enzyme function involved in critical cellular signaling pathways, including those regulating metabolism, cell cycle progression, and apoptosis. It is widely applied in pharmacological and toxicological studies to evaluate drug effects or disease states involving altered phosphorylation balance. The assay provides a sensitive and specific colorimetric measurement, allowing high-throughput analysis in research settings focused on signal transduction mechanisms in rat models.