Used in immunological research to quantify levels of secondary lymphoid tissue chemokine (CCL21) in biological samples such as serum, plasma, or tissue culture supernatants. This ELISA kit helps study immune cell trafficking, lymphoid organ development, and inflammatory responses. It is widely applied in research on autoimmune diseases, cancer immunology, and vaccine development where CCL21-mediated recruitment of T cells and dendritic cells plays a critical role. The assay provides a sensitive and specific means to monitor CCL21 expression under experimental or pathological conditions.