Synonyms : C4b-Binding Protein, C4b-C3b Inactivator Cofactor, C4bC3bINA-Cofactor, Complement 4b Binding Protein, Complement C3b-C4b Inactivator Cofactor, Complement Component 4b-Binding Protein, C4b Binding Protein, C4b C3b Inactivator Cofactor, C4bC3bINA Cofactor