HLA-DRB1 and systemic lupus erythematosus: Analysis of nRNP+/- SLE versus controls found DRB1 residues 9 and 11 associated (Pomnibus = 9.7x10-25, 1.4x10-22, respectively) with nRNP+, and DRB1-13 and 11 with nRNP- (Pomnibus = 5.1x10-24, 6.1x10-22).