RT Book, Section A1 Greidinger, Eric L. A2 Janson, Lee W. A2 Tischler, Marc E. SR Print(0) ID 1152118787 T1 THE IMMUNE SYSTEM T2 The Big Picture: Medical Biochemistry YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9780071637916 LK accessmedicine.mhmedical.com/content.aspx?aid=1152118787 RD 2024/10/04 AB The immune system, composed of antigens, antibodies, and several specialized leukocyte (white blood cell) types, offers the human body adaptable protection against infections and invasion by foreign molecules and cells. Besides responses by antibodies and cells, the immune system is also composed of a complement-activated pathway that allows an alternative to respond to infectious organisms.