Carstairs staining of the SIPA clot in the transverse direction. (A-I) Starting from the upstream end, each section is spaced ∼0.5 mm apart. (J) The plot shows portion of blood clot components (platelet, fibrin, RBC, and void) found in Figure 4 A to I. Sequential sections corresponding to the regions of interest indicated in Figure 2B (R1a-R4b).