Several autoimmune diseases (i.e., anti-phospholipid [APL] syndrome [APS] and systemic lupus erythematosus [SLE]) characterized by the production of APL autoantibodies are known to be associated with recurrent vascular thrombosis and/or obstetrical complications, including abortion, where APL autoantibodies are believed to play a causal role [1, 2]. The gene discussed is FASLG; the disease is systemic lupus erythematosus.