RGD peptide is a short amino acid sequence composed of the three letters R, G, and D. RGD stands for Arginine-Glycine-Aspartate. This peptide is found in many extracellular matrix (ECM) proteins and plays a critical role in cell adhesion and migration. RGD peptides bind to integrin receptors on cell surfaces, which in turn triggers various signaling pathways that promote cell attachment, spreading, and migration. RGD peptides can be synthesized and used as biomaterial coatings for tissue engineering applications or as therapeutic agents to target tumors or inflammation.