HLA-DRB1 and systemic lupus erythematosus: We preventively verified that carb-LL37 could bind HLA-molecules and we choose to test binding to HLA-DR1 (DRB1*0101), as an example of the most diffuse HLA-DR alleles in Caucasians and HLA-DR15 (DRB1*1501), which is associated with SLE [26,27].