Product name:Human C4b ELISA Kit
C4 plays a central role in the activation of the classical pathway of the complement system. Human complement component C4 is polymorphic at two loci, C4A and C4B. The C4A alleles carry the Rodgers (Rg) while the C4B alleles carry the Chido (Ch) blood group antigens. C4 (either allele A or B) protein is expressed as a single chain precursor which is proteolytically cleaved into a trimer of alpha, beta, and gamma chains prior to secretion. The trimer provides a surface for interaction between the antigen-antibody complex and other complement components. During activation, the alpha chain is cleaved by C1 into C4a and C4b, and C4b stays linked to the beta and gamma chains.