Human C4A Recombinant Protein (N-His) is a recombinant protein expressed in E. coli, spanning Ala1580-Val1744, with an N-terminal His tag. Predicted molecular weight: 21.33 kDa. Purity: >90% as determined by SDS-PAGE. Supplied lyophilized from a solution in PBS pH 7.4, 1 mM EDTA, 4% Trehalose, 1% Mannitol. Applications: ELISA, immunogen, SDS-PAGE and Western blot. Complement C4-A is a ~192 kDa protein. Precursor of non-enzymatic components of the classical, lectin and GZMK complement pathways, which consist in a cascade of proteins that leads to phagocytosis and breakdown of pathogens and signaling that strengthens the adaptive immune system. For research use only.