CD18

CD18 is a protein found on the surface of certain immune cells, such as white blood cells. It plays a key role in helping these cells stick to blood vessel walls and move to sites of infection or injury. CD18 is part of a larger complex called integrins, which act like cellular "hands" that grip and interact with other molecules. Proper function of CD18 is essential for effective immune response; when it's defective or missing, it can lead to immune system disorders like leukocyte adhesion deficiency, making it harder for the body to fight infections.