Used in flow cytometry and immunofluorescence assays to detect CD107a expression on the surface of cytotoxic T cells and NK cells, serving as a marker for degranulation and cellular activation. Enables monitoring of immune responses in cancer immunotherapy, infectious disease research, and autoimmune disorders. Supports antibody-dependent cell-mediated cytotoxicity (ADCC) studies and is utilized in the development and quality control of biologics, particularly in assessing effector cell function during therapeutic antibody evaluation. Also applied in cell therapy development, including CAR-T and CAR-NK cell characterization.