The Fas receptor is a protein found on the surface of cells that plays a crucial role in regulating programmed cell death, also known as apoptosis. When the Fas receptor binds to its ligand, Fas ligand, it triggers a cascade of signals that lead to the self-destruction of the cell. This process is essential for maintaining healthy tissue and eliminating damaged or potentially harmful cells. Dysfunction of the Fas receptor can lead to various health issues, including autoimmune diseases and cancer. In some cases, cancer cells may evade apoptosis by altering Fas signaling, allowing them to survive and proliferate. Understanding the mechanisms of the Fas receptor is important for developing targeted therapies in treating these conditions.