F2 and autoimmune polyendocrinopathy: Moreover, a seronegative status for the three autoantibodies included in the criteria might not exclude APS, and several other autoantibodies have been suggested to be tested: IgA aCL or ab2GPI, Abs to annexin V, prothrombin (PT), phosphatidylserine/prothrombin (PS/PT), phospholipids other than cardiolipin such as phosphatidylethanolamine (PE), and domain I of b2GPI, etc. [137,138,139].