We also examined our database of expression profiles of 10 men and 9 women with facioscapulohumeral dystrophy [25] for a sex difference in expression of GRB10 and ACVR2B. The women had higher expression of GRB10 (2.7-fold, P<0.001) and ACVR2B (1.7-fold, P<0.03). Here, GRB10 is linked to Facioscapulohumeral dystrophy.