Investigations on the primary structure of human plasminogen. Further evidence for sequence homology

NH2-Terminal sequences were determined by the automated Edman method in four fragments which were isolated from a mixture of fragments obtained by CNBr cleavage of human plasminogen. One of the fragments whose sequence was determined over the first 31 residues shows sequence homologies with the fragment that forms the linkage between the plasmin chains and also with the non-thrombin part of prothrombin.