Used in biomedical research to quantify levels of Peptidyl Arginine Deimidase 4 (PAD4) in biological samples such as cell lysates, serum, or tissue extracts. This kit enables researchers to study PAD4 involvement in post-translational modifications, particularly citrullination, which plays a role in gene regulation, chromatin remodeling, and the pathogenesis of autoimmune diseases like rheumatoid arthritis. It is commonly applied in immunology and epigenetics studies to monitor enzyme activity and expression under various experimental or disease conditions. The assay supports high-throughput screening and provides a reliable tool for investigating the role of PAD4 in inflammation, cancer, and neurodegenerative disorders.