title: IgM deficiency in systemic lupus erythematosus patients.
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007075:Immunoglobulin M / Q000172:deficiency*; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D008297:Male; D008875:Middle Aged
chemical_list: D007075:Immunoglobulin M