Used in immunological research to quantify Flt3L levels in biological samples such as serum, plasma, and cell culture supernatants. Enables study of dendritic cell development, hematopoiesis, and immune response regulation. Commonly applied in preclinical studies of cancer immunotherapy, vaccine development, and autoimmune diseases. Supports evaluation of therapeutic efficacy by monitoring changes in Flt3L concentration. Suitable for high-throughput screening and mechanistic studies in both mouse models and experimental immunology.