These cells present fragments of cancer antigens on their cell membrane and convey the characteristics of cancer cells to lymphocytes such as cancer antigen-specific cytotoxic T lymphocytes [CTL] and CD4T cells via major histocompatibility complex (MHC) classes I and II and co-stimulatory molecules CD80 and CD86, thus activating T cells [7]. The gene discussed is CD80; the disease is cancer.