Features of thrombi in patients with thrombotic stroke and VTE. (A) Time from symptom onset for acute thrombotic stroke (n = 13) and VTE (DVT and PE; n = 12) was reported as mean ± standard error of the mean (SEM). ∗P < .0001 (Mann-Whitney U test [MWU]). (B) Arterial thrombi (n = 13) and venous thrombi (DVT and PE, n = 12) by catheter and the concentration of protein in 7 mg of tissue were assessed. The venous thrombi were more heterogeneous than the arterial thrombi. Protein concentration was measured using the Bradford method and reported as the mean ± SEM. ∗P = .031 between groups by MWU.