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Immunity refers to the ability of a body to defend itself against disease causing organisms. The immune system can be categorized into innate immune system and adaptive immune system. The innate immune system is an evolutionary defense system, which is a principal immune system response identified in insects, plants, primitive multicellular organisms and fungi. Its primary functions include activating the adaptive immune system with the help of antigen presentation, and recruiting immune cells to infection sites by generating chemical factors and chemical mediators such as cytokines. The adaptive immune system refers to a subsystem of the immune system, consisting of systematic processes and cells, which eliminate and inhibit pathogen growth. It has both cell-mediated and humoral immunity components, which help in destroying the invading pathogens. This book is a vital tool for all researching and studying the molecular aspects of innate and adaptive immunity. It presents researches and studies performed by experts across the globe. This book provides significant information to help develop a good understanding of innate and adaptive immunity.
