Behavior of fibrinogen-associated albumin in the cross-linked Marburg fibrin as analyzed by immunoblotting. Fibrinogen Marburg was clotted with thrombin and factor XIII in the presence (A) or absence (B) of α₂-PI and then subjected to immunoblotting using an anti-human albumin antibody. Band 1 represents noncross-linked albumin, and band 2 represents the cross-linked albumin with a fibrin-derived subunit.