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The binary complex of streptokinase with bound plasmin. The complex of streptokinase and the catalytic domain of plasmin (blue) (PDB ID 1BML). Streptokinase contains three β-grasp domains embracing the plasmin catalytic domain: domain α (gray), domain β (red), and domain γ (green). The catalytic triad of plasmin His603, Asp646, and Ser741 are shown as red beads.
