Tests and terminology in psoriasis: T

cells that either initiate the immune response (helper T-cells) or actively target and destroy cells perceived as foreign (killer T-cells)

molecules on the surface of T-cells that are the sites for macrophages to ‘pre- sent’ antigens to the T-cell and trigger an immune response

a type of white blood cell within the immune system

treatments that are applied to the skin rather than being taken internally

an environmental factor that acts together with genetic predisposition to cause the onset or worsening of psoriasis

a protein in the body involved in inflammatory processes that also damages tissue in and around the joints of people with psoriatic arthritis.