Used in immunological research to quantify levels of Toll-like Receptor 9 (TLR-9) in biological samples such as serum, plasma, and cell lysates. This ELISA kit enables researchers to study TLR-9 expression in immune cells, particularly in response to microbial DNA containing CpG motifs. It is widely applied in studies related to innate immunity, autoimmune diseases, vaccine development, and inflammatory disorders. The assay supports the evaluation of drug effects on TLR-9 signaling pathways and helps in understanding the role of TLR-9 in infections, cancer, and therapeutic interventions targeting the immune system.