SERPINC1 and autoimmune polyendocrinopathy: In plasma fibrin clots of thrombotic APS patients compared with the remaining VTE subjects or controls we observed decreased content of antithrombin-III (ATIII), prothrombin (F2), FXIII alpha chain, apo A-I, and HRG (all p < 0.05) in clots (Supplemental Table 1).