L-selectin

L-selectin is a type of protein found on the surface of certain immune cells, such as white blood cells. Its main role is to help these cells move from the blood into tissues where they are needed to fight infection or repair damage. It acts like a "welcome mat" or traffic controller, recognizing signals on the blood vessel walls, allowing the immune cells to slow down, stick temporarily, and then pass through the vessel wall into the affected tissue. This process is essential for the body's immune response and maintaining health.