Your complement system consists of a group of important proteins in your bloodstream. These proteins help your immune system fight off harmful invaders, such as bacteria, and other foreign substances.

Circulating cold-insoluble complexes, observed in 11 of 31 patients with systemic lupus erythematosus (SLE), consisted mainly of immunoglobulin G and the C′lq component of complement and did not ...

TWO inborn errors of the complement system of man have been well documented: hereditary deficiency of the serum inhibitor of the activated first component of complement (C′1a) and hereditary ...