Patients who were negative for aβ2GPI IgG or IgM antibodies, but who showed either isolated LAC or aCL or aPS/PT-positive antibodies demonstrated significantly lower PAF-AH activities that appeared comparable to those measured in BDs (Fig. 2; 16.9 ± 3.8 nmol/min/ml; p = ns vs. BDs; p = 0.003 vs. aβ2GPI IgM+). Here, CD40LG is linked to Diamond-Blackfan anemia.