Used for the quantitative detection of ISG15 protein levels in biological samples such as serum, plasma, cell lysates, and tissue homogenates. This research kit is commonly applied in immunology and virology studies to monitor innate immune responses, as ISG15 is upregulated in response to type I interferons and viral infections. It is also utilized in cancer research and autoimmune disease studies to assess the activation status of interferon signaling pathways. The assay enables high sensitivity and specificity, allowing researchers to measure changes in ISG15 expression under experimental conditions, supporting biomarker discovery and therapeutic development.