Innate immunity is the oldest form of defense and is found to some degree in all species. It predates the adaptive immune system, consisting of antibodies, B cells, T cells, and the major histocompatibility antigens. These are found only in higher vertebrates and have been the focus of the majority of immunological research, particularly in mice and humans, over the years. Knowledge of immunity in lower vertebrate and invertebrate species is now increasing rapidly, shedding light on the evolution of immunity and in many cases adding to our understanding of the mammalian system. Several recurring structural, genetic, and developmental mechanisms are common features in these processes in both the cellular and the molecular aspects of innate immunity.
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