Complement component 3 (C3) is the key component of the complement system. It is referred to as ASP, C3a, C3ß, AHUS5, ARMD9, CPAMD1 and HEL-S-62p. C3 is acted upon by C3 convertases, which produces the activated C3b. It is a member of the a2-macroglobulin protein family. It possesses an a- and...