BK-1361 (cyclo(RLsKDK)) is a synthetic cyclic peptide primarily utilized in biomedical research, particularly in the study of cell signaling pathways and protein interactions. Its cyclic structure provides stability and specific binding to targets, making it a valuable tool for modulating biological processes, investigating cellular mechanisms, and developing therapeutic strategies. Applications often focus on understanding the role of peptides in disease progression, offering insights for targeted drug development, including potential roles in immune-related diseases, cellular dysfunction, infections, and cancer. Additionally, it is used in experimental studies to explore effects on immune responses and inflammation, contributing to advancements in immunology and related fields. Research is ongoing, requiring further studies to confirm efficacy and safety.