Used to measure FAS (Fatty Acid Synthase) enzyme activity in rat biological samples such as tissue lysates or cell extracts. This kit is commonly applied in metabolic research, especially in studies related to lipid metabolism, obesity, diabetes, and liver diseases. It enables researchers to quantify changes in FAS levels under different experimental conditions, helping assess the regulation of fatty acid synthesis in rat models. The assay is useful in drug development and toxicology studies where metabolic pathways are targeted or affected.