Used in immunological research to quantify levels of programmed death ligand 1 (PDL1) in mouse biological samples such as serum, plasma, and cell culture supernatants. Enables researchers to study immune checkpoint pathways, particularly in cancer immunotherapy studies where PDL1 expression modulates T-cell activity. Commonly applied in preclinical models to evaluate therapeutic responses, monitor disease progression, and assess the efficacy of immune-modulating drugs. The kit provides a sensitive and specific method for detecting fine vesicle-associated PDL1, supporting investigations into tumor microenvironment signaling and exosome-mediated immune regulation.