DR4 (Death Receptor 4)

DR4, also known as Death Receptor 4, is a protein found on the surface of some cells that helps regulate cell death, or apoptosis. It is part of the body's way of controlling cell growth and eliminating damaged or unwanted cells. When specific signals, like the molecule TRAIL, bind to DR4, it triggers a chain reaction inside the cell that leads to apoptosis. This process is vital for maintaining healthy tissue and preventing diseases such as cancer. In short, DR4 acts as a molecular switch that can promote cell death when necessary to keep the body balanced.