Unfractionated (UF), or purified γA/γA, or γA/γ’ fibrinogen were reduced and separated by 10% SDS-PAGE and detected by: A) Coomassie Brilliant Blue staining, B) polyclonal anti-fibrin(ogen) antibody, or C) 2.G2.H9 antibody against the γ’ chain. D) Purified human γA/γA (squares) or γA/γ’ (diamonds) fibrinogen was clotted in the presence of CaCl2 and human (closed symbols) or murine (open symbols) thrombin. Data show mean±SD, for experiments with human (n=3) and mouse (n=2) thrombin.