补体系统的研究是近20多年来医学研究领域中进展很快的一个方面。补体直接参与免疫、过敏、炎症等反应,因此和许多疾病的发病机制有关。从血清中分离到的补体系统成分已有20种以上,按其作用可分三类:溶血补体成分、C3旁路活化成分和调节成分。正常血液中的补体成分实际 Complement system research is one of the areas where medical research has progressed rapidly in the past two decades. Complement directly involved in immune, allergic, inflammatory and other reactions, and pathogenesis of many diseases. From the serum isolated complement system components have been more than 20 kinds, according to their role can be divided into three categories: hemolysis complement components, C3 bypass activation components and regulatory components. Normal blood complement components in reality