FSLLRY-amide is primarily utilized in research settings to study the role of G protein-coupled receptors (GPCRs), particularly those involved in the activation of protease-activated receptors (PARs). It acts as a PAR1 antagonist, making it a valuable tool for investigating cellular signaling pathways, inflammation, and thrombosis. Researchers use it to block PAR1 activity, helping to understand its role in platelet aggregation, vascular function, and cancer progression. This compound is also employed in pharmacological studies to develop therapeutic agents targeting PAR1-related diseases. Its application extends to in vitro and in vivo experiments, aiding in the exploration of receptor mechanisms and potential drug targets.