TAT-cyclo-CLLFVY is a cyclic peptide that has shown potential in various biomedical applications, particularly in targeted drug delivery and cancer therapy. Its ability to penetrate cell membranes efficiently makes it a promising candidate for delivering therapeutic agents directly into cells, including those that are typically hard to target. This peptide is often explored for its role in enhancing the uptake of drugs in cancer cells, thereby improving the efficacy of treatments while minimizing side effects. Additionally, its specificity and stability make it a valuable tool in research for studying cell signaling pathways and protein interactions.