"Innate immunity is the ancient defence system against infection that is conserved in most of organisms including prokaryotes and invertebrates throughout evolution. Among the cells that participate in the early innate immune response, natural killer (NK) cells occupies special positions, not only owing to its unique cytotoxic ability but its role between the innate and adaptive immunity put it to the high level of interest."
Read the full Sciences Dissertation | Innate Immunity here...