Examples are shown for mice with the following genotypes: A-D. LDL receptor −/−. E-H. uPAR −/− x LDL receptor −/−. I-P. uPA −/− x LDL receptor −/−. A, E, I, M. Verhoeff staining (40X). B, F, J, N. Gomori staining (40X). C, G, K, O. Fibrin/fibrinogen staining (40X). D, H, L, P. Fibrin/fibrinogen staining (100X). * Represents a typical acellular fibrin-rich thrombi area.